AP Precalculus Flashcards: Rational Functions And End Behavior

Study Rational Functions And End Behavior in AP Precalculus with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.

AP Precalculus

Rational Functions And End Behavior

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QUESTION
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State the vertical asymptotes for f(x)=1x24x+4f(x) = \frac{1}{x^2 - 4x + 4}.

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ANSWER

Vertical asymptote at x=2x = 2. Perfect square: (x2)2=0(x-2)^2 = 0 gives x=2x = 2.

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This deck focuses on Rational Functions And End Behavior, giving you a quick way to review the definitions, rules, and examples that matter most for AP Precalculus.

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Flashcard 1: State the vertical asymptotes for f(x)=1x24x+4f(x) = \frac{1}{x^2 - 4x + 4}.

Answer: Vertical asymptote at x=2x = 2. Perfect square: (x2)2=0(x-2)^2 = 0 gives x=2x = 2.

Flashcard 2: What is the end behavior of f(x)=3x32x3+5f(x) = \frac{3x^3}{2x^3 + 5} as xx approaches infinity?

Answer: f(x)f(x) approaches 32\frac{3}{2} as xx \to \infty. Same degree: divide leading coefficients 32\frac{3}{2}.

Flashcard 3: State the vertical asymptotes for f(x)=x21x24f(x) = \frac{x^2-1}{x^2-4}.

Answer: Vertical asymptotes at x=2x = 2 and x=2x = -2. Factor denominator: (x2)(x+2)=0(x-2)(x+2) = 0.

Flashcard 4: What is a removable discontinuity in rational functions?

Answer: A hole where p(x)p(x) and q(x)q(x) share a common factor. Common factors cancel, creating a hole.

Flashcard 5: What is the end behavior of f(x)=2x2x3+1f(x) = \frac{2x^2}{x^3 + 1} as xx \to \infty?

Answer: f(x)f(x) approaches 00 as xx \to \infty. Numerator degree less than denominator degree.

Flashcard 6: State the horizontal asymptote of f(x)=2x2+3x21f(x) = \frac{2x^2+3}{x^2-1}.

Answer: Horizontal asymptote at y=2y = 2. Same degree polynomials: ratio of leading coefficients.

Flashcard 7: What is the horizontal asymptote of f(x)=3xx+4f(x) = \frac{3x}{x + 4}?

Answer: Horizontal asymptote at y=3y = 3. Same degree: ratio of leading coefficients 31\frac{3}{1}.

Flashcard 8: Determine the vertical asymptote of f(x)=x2+1x24x+3f(x) = \frac{x^2 + 1}{x^2 - 4x + 3}.

Answer: Vertical asymptotes at x=3x = 3 and x=1x = 1. Factor denominator: (x3)(x1)=0(x-3)(x-1) = 0.

Flashcard 9: What is the horizontal asymptote for f(x)=2xx2+3f(x) = \frac{2x}{x^2+3}?

Answer: Horizontal asymptote at y=0y = 0. Numerator degree less than denominator degree.

Flashcard 10: What is the end behavior of f(x)=x2+2x+1x2f(x) = \frac{x^2 + 2x + 1}{x^2} as xx \to \infty?

Answer: f(x)f(x) approaches 11 as xx \to \infty. Expand and simplify: x2+2x+1x2=1+2x+1x2\frac{x^2+2x+1}{x^2} = 1 + \frac{2}{x} + \frac{1}{x^2}.

Flashcard 11: What is the end behavior of f(x)=2x3x2+1f(x) = \frac{2x^3}{x^2+1} as xx \to -\infty?

Answer: f(x)f(x) approaches -\infty as xx \to -\infty. Numerator degree exceeds denominator, goes to -\infty.

Flashcard 12: Find the vertical asymptote of f(x)=x2+1x5f(x) = \frac{x^2 + 1}{x - 5}.

Answer: Vertical asymptote at x=5x = 5. Set denominator equal to zero: x5=0x - 5 = 0.

Flashcard 13: State the horizontal asymptote for f(x)=4x+37x+8f(x) = \frac{4x+3}{7x+8}.

Answer: Horizontal asymptote at y=47y = \frac{4}{7}. Same degree: ratio of leading coefficients 47\frac{4}{7}.

Flashcard 14: Determine the horizontal asymptote of f(x)=x+2x2+3x+1f(x) = \frac{x+2}{x^2+3x+1}.

Answer: Horizontal asymptote at y=0y = 0. Numerator degree less than denominator degree.

Flashcard 15: What is the end behavior of f(x)=3x4x2+1f(x) = \frac{3x^4}{x^2 + 1} as xx \to \infty?

Answer: f(x)f(x) approaches \infty as xx \to \infty. Numerator degree exceeds denominator degree.

Flashcard 16: Determine the end behavior of f(x)=x2x3+1f(x) = \frac{x^2}{x^3+1} as xx \to -\infty.

Answer: f(x)f(x) approaches 00 as xx \to -\infty. Degree of numerator less than denominator.

Flashcard 17: What is the vertical asymptote of f(x)=2x2x29f(x) = \frac{2x^2}{x^2 - 9}?

Answer: Vertical asymptotes at x=3x = 3 and x=3x = -3. Factor denominator: (x3)(x+3)=0(x-3)(x+3) = 0.

Flashcard 18: State the vertical asymptotes for f(x)=x24x25x+6f(x) = \frac{x^2-4}{x^2-5x+6}.

Answer: Vertical asymptotes at x=3x = 3 and x=2x = 2. Factor denominator: (x3)(x2)=0(x-3)(x-2) = 0.

Flashcard 19: Identify the vertical asymptote for f(x)=x+1x3f(x) = \frac{x+1}{x-3}.

Answer: Vertical asymptote at x=3x = 3. Set denominator equal to zero: x3=0x - 3 = 0.

Flashcard 20: What does the end behavior of f(x)=x3x+1f(x) = \frac{x^3}{x+1} as xx \to \infty approach?

Answer: f(x)f(x) approaches \infty as xx \to \infty. Numerator degree exceeds denominator degree.

Flashcard 21: State the vertical asymptotes for f(x)=x24x25x+6f(x) = \frac{x^2-4}{x^2-5x+6}.

Answer: Vertical asymptotes at x=3x = 3 and x=2x = 2. Factor denominator: (x3)(x2)=0(x-3)(x-2) = 0.

Flashcard 22: What is the horizontal asymptote for f(x)=5x+12x3f(x) = \frac{5x+1}{2x-3}?

Answer: Horizontal asymptote at y=52y = \frac{5}{2}. Same degree: ratio of leading coefficients 52\frac{5}{2}.

Flashcard 23: What does the end behavior of f(x)=x3x+1f(x) = \frac{x^3}{x+1} as xx \to \infty approach?

Answer: f(x)f(x) approaches \infty as xx \to \infty. Numerator degree exceeds denominator degree.

Flashcard 24: Find the vertical asymptote of f(x)=x2+1x5f(x) = \frac{x^2 + 1}{x - 5}.

Answer: Vertical asymptote at x=5x = 5. Set denominator equal to zero: x5=0x - 5 = 0.

Flashcard 25: What is the end behavior of f(x)=1xf(x) = \frac{1}{x} as xx approaches \infty?

Answer: f(x)f(x) approaches 00 as xx \to \infty. As denominator grows, fraction approaches zero.

Flashcard 26: State the vertical asymptotes for f(x)=1x24x+4f(x) = \frac{1}{x^2 - 4x + 4}.

Answer: Vertical asymptote at x=2x = 2. Perfect square: (x2)2=0(x-2)^2 = 0 gives x=2x = 2.

Flashcard 27: Identify the horizontal asymptote for f(x)=5x33x3+1f(x) = \frac{5x^3}{3x^3 + 1}.

Answer: Horizontal asymptote at y=53y = \frac{5}{3}. Same degree: ratio of leading coefficients 53\frac{5}{3}.

Flashcard 28: Identify the removable discontinuity of f(x)=x21x2+xf(x) = \frac{x^2-1}{x^2+x}.

Answer: Removable discontinuity at x=1x = -1. Factor: (x1)(x+1)x(x+1)\frac{(x-1)(x+1)}{x(x+1)} cancels (x+1)(x+1).

Flashcard 29: What is the end behavior of f(x)=2x3x2+1f(x) = \frac{2x^3}{x^2+1} as xx \to -\infty?

Answer: f(x)f(x) approaches -\infty as xx \to -\infty. Numerator degree exceeds denominator, goes to -\infty.

Flashcard 30: What is the end behavior of f(x)=x2+2x+1x2f(x) = \frac{x^2 + 2x + 1}{x^2} as xx \to \infty?

Answer: f(x)f(x) approaches 11 as xx \to \infty. Expand and simplify: x2+2x+1x2=1+2x+1x2\frac{x^2+2x+1}{x^2} = 1 + \frac{2}{x} + \frac{1}{x^2}.

Flashcard 31: State the vertical asymptotes for f(x)=x21x24f(x) = \frac{x^2-1}{x^2-4}.

Answer: Vertical asymptotes at x=2x = 2 and x=2x = -2. Factor denominator: (x2)(x+2)=0(x-2)(x+2) = 0.

Flashcard 32: Identify the removable discontinuity of f(x)=x21x2+xf(x) = \frac{x^2-1}{x^2+x}.

Answer: Removable discontinuity at x=1x = -1. Factor: (x1)(x+1)x(x+1)\frac{(x-1)(x+1)}{x(x+1)} cancels (x+1)(x+1).

Flashcard 33: Identify the removable discontinuity of f(x)=(x2)(x+3)x2f(x) = \frac{(x-2)(x+3)}{x-2}.

Answer: Removable discontinuity at x=2x = 2. Common factor (x2)(x-2) cancels out.

Flashcard 34: What is the horizontal asymptote of f(x)=x2+12x23x+5f(x) = \frac{x^2+1}{2x^2-3x+5}?

Answer: Horizontal asymptote at y=12y = \frac{1}{2}. Same degree: ratio of leading coefficients 12\frac{1}{2}.

Flashcard 35: What is the vertical asymptote of f(x)=2x2x29f(x) = \frac{2x^2}{x^2 - 9}?

Answer: Vertical asymptotes at x=3x = 3 and x=3x = -3. Factor denominator: (x3)(x+3)=0(x-3)(x+3) = 0.

Flashcard 36: What is a removable discontinuity in rational functions?

Answer: A hole where p(x)p(x) and q(x)q(x) share a common factor. Common factors cancel, creating a hole.

Flashcard 37: Identify the vertical asymptote for f(x)=x+1x3f(x) = \frac{x+1}{x-3}.

Answer: Vertical asymptote at x=3x = 3. Set denominator equal to zero: x3=0x - 3 = 0.

Flashcard 38: What is the end behavior of f(x)=2x2x3+1f(x) = \frac{2x^2}{x^3 + 1} as xx \to \infty?

Answer: f(x)f(x) approaches 00 as xx \to \infty. Numerator degree less than denominator degree.

Flashcard 39: Determine the vertical asymptote of f(x)=xx22x3f(x) = \frac{x}{x^2-2x-3}.

Answer: Vertical asymptotes at x=3x = 3 and x=1x = -1. Factor denominator: (x3)(x+1)=0(x-3)(x+1) = 0.

Flashcard 40: What is a rational function?

Answer: A function of the form f(x)=p(x)q(x)f(x) = \frac{p(x)}{q(x)} where p(x)p(x) and q(x)q(x) are polynomials. The numerator and denominator must be polynomials.

Flashcard 41: Determine the horizontal asymptote of f(x)=x+2x2+3x+1f(x) = \frac{x+2}{x^2+3x+1}.

Answer: Horizontal asymptote at y=0y = 0. Numerator degree less than denominator degree.

Flashcard 42: What is the horizontal asymptote for f(x)=2xx2+3f(x) = \frac{2x}{x^2+3}?

Answer: Horizontal asymptote at y=0y = 0. Numerator degree less than denominator degree.

Flashcard 43: State the horizontal asymptote for f(x)=4x+37x+8f(x) = \frac{4x+3}{7x+8}.

Answer: Horizontal asymptote at y=47y = \frac{4}{7}. Same degree: ratio of leading coefficients 47\frac{4}{7}.

Flashcard 44: Determine the vertical asymptote of f(x)=xx22x3f(x) = \frac{x}{x^2-2x-3}.

Answer: Vertical asymptotes at x=3x = 3 and x=1x = -1. Factor denominator: (x3)(x+1)=0(x-3)(x+1) = 0.

Flashcard 45: What is the domain of f(x)=1x29f(x) = \frac{1}{x^2 - 9}?

Answer: All real numbers except x=3x = 3 and x=3x = -3. Exclude values where x29=0x^2 - 9 = 0.

Flashcard 46: What is the domain of f(x)=5xx24f(x) = \frac{5x}{x^2 - 4}?

Answer: All real numbers except x=2x = 2 and x=2x = -2. Exclude values where x24=0x^2 - 4 = 0.

Flashcard 47: Identify the horizontal asymptote for f(x)=2x2x2+1f(x) = \frac{2x^2}{x^2 + 1}.

Answer: Horizontal asymptote at y=2y = 2. Same degree: ratio of leading coefficients 21\frac{2}{1}.

Flashcard 48: What is the domain of f(x)=2x4f(x) = \frac{2}{x-4}?

Answer: All real numbers except x=4x = 4. Exclude values where denominator equals zero.

Flashcard 49: What is the slant asymptote of f(x)=x2+2x+3x1f(x) = \frac{x^2 + 2x + 3}{x - 1}?

Answer: Slant asymptote is y=x+3y = x + 3. Numerator degree exceeds denominator by one.

Flashcard 50: What is the domain of f(x)=5xx24f(x) = \frac{5x}{x^2 - 4}?

Answer: All real numbers except x=2x = 2 and x=2x = -2. Exclude values where x24=0x^2 - 4 = 0.

Flashcard 51: What is a rational function?

Answer: A function of the form f(x)=p(x)q(x)f(x) = \frac{p(x)}{q(x)} where p(x)p(x) and q(x)q(x) are polynomials. The numerator and denominator must be polynomials.

Flashcard 52: What is the domain of f(x)=1x29f(x) = \frac{1}{x^2 - 9}?

Answer: All real numbers except x=3x = 3 and x=3x = -3. Exclude values where x29=0x^2 - 9 = 0.

Flashcard 53: What is the end behavior of f(x)=1xf(x) = \frac{1}{x} as xx approaches \infty?

Answer: f(x)f(x) approaches 00 as xx \to \infty. As denominator grows, fraction approaches zero.

Flashcard 54: Identify the horizontal asymptote for f(x)=2x2x2+1f(x) = \frac{2x^2}{x^2 + 1}.

Answer: Horizontal asymptote at y=2y = 2. Same degree: ratio of leading coefficients 21\frac{2}{1}.

Flashcard 55: Identify the removable discontinuity of f(x)=(x2)(x+3)x2f(x) = \frac{(x-2)(x+3)}{x-2}.

Answer: Removable discontinuity at x=2x = 2. Common factor (x2)(x-2) cancels out.

Flashcard 56: Does f(x)=x24x2+4f(x) = \frac{x^2-4}{x^2+4} have a horizontal asymptote?

Answer: Yes, y=1y = 1. Same degree polynomials have horizontal asymptote.

Flashcard 57: What is the horizontal asymptote for f(x)=5x+12x3f(x) = \frac{5x+1}{2x-3}?

Answer: Horizontal asymptote at y=52y = \frac{5}{2}. Same degree: ratio of leading coefficients 52\frac{5}{2}.

Flashcard 58: Does f(x)=x24x2+4f(x) = \frac{x^2-4}{x^2+4} have a horizontal asymptote?

Answer: Yes, y=1y = 1. Same degree polynomials have horizontal asymptote.

Flashcard 59: State the horizontal asymptote of f(x)=2x2+3x21f(x) = \frac{2x^2+3}{x^2-1}.

Answer: Horizontal asymptote at y=2y = 2. Same degree polynomials: ratio of leading coefficients.

Flashcard 60: What is the domain of f(x)=x2+3x4x24f(x) = \frac{x^2 + 3x - 4}{x^2 - 4}?

Answer: All real numbers except x=2x = 2 and x=2x = -2. Exclude values where x24=0x^2 - 4 = 0.

Flashcard 61: What is the slant asymptote of f(x)=x2+2x+3x1f(x) = \frac{x^2 + 2x + 3}{x - 1}?

Answer: Slant asymptote is y=x+3y = x + 3. Numerator degree exceeds denominator by one.

Flashcard 62: What is the domain of f(x)=x2+3x4x24f(x) = \frac{x^2 + 3x - 4}{x^2 - 4}?

Answer: All real numbers except x=2x = 2 and x=2x = -2. Exclude values where x24=0x^2 - 4 = 0.

Flashcard 63: Identify the horizontal asymptote for f(x)=5x33x3+1f(x) = \frac{5x^3}{3x^3 + 1}.

Answer: Horizontal asymptote at y=53y = \frac{5}{3}. Same degree: ratio of leading coefficients 53\frac{5}{3}.

Flashcard 64: Determine the vertical asymptote of f(x)=x2+1x24x+3f(x) = \frac{x^2 + 1}{x^2 - 4x + 3}.

Answer: Vertical asymptotes at x=3x = 3 and x=1x = 1. Factor denominator: (x3)(x1)=0(x-3)(x-1) = 0.

Flashcard 65: What is the end behavior of f(x)=3x4x2+1f(x) = \frac{3x^4}{x^2 + 1} as xx \to \infty?

Answer: f(x)f(x) approaches \infty as xx \to \infty. Numerator degree exceeds denominator degree.

Flashcard 66: Determine the end behavior of f(x)=x2x3+1f(x) = \frac{x^2}{x^3+1} as xx \to -\infty.

Answer: f(x)f(x) approaches 00 as xx \to -\infty. Degree of numerator less than denominator.

Flashcard 67: What is the end behavior of f(x)=3x32x3+5f(x) = \frac{3x^3}{2x^3 + 5} as xx approaches infinity?

Answer: f(x)f(x) approaches 32\frac{3}{2} as xx \to \infty. Same degree: divide leading coefficients 32\frac{3}{2}.

Flashcard 68: What is the horizontal asymptote of f(x)=x2+12x23x+5f(x) = \frac{x^2+1}{2x^2-3x+5}?

Answer: Horizontal asymptote at y=12y = \frac{1}{2}. Same degree: ratio of leading coefficients 12\frac{1}{2}.

Flashcard 69: What is the horizontal asymptote of f(x)=3xx+4f(x) = \frac{3x}{x + 4}?

Answer: Horizontal asymptote at y=3y = 3. Same degree: ratio of leading coefficients 31\frac{3}{1}.