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PSAT Math : Algebra

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Example Questions

Example Question #5 : How To Find A Rational Number From An Exponent

$\sqrt{x+3} -x = 1$

Possible Answers:

x=9

x=0

x=13

x=1

x=4

Correct answer:

x=1

Explanation:

From the equation in the problem statement

$\sqrt{x+3} = x + 1$

Now squaring both sides we get

$x+3=x^{2}+2x+1$ this is a quadratic equation which equals

$x^{2}+x -2 = 0$

and the factors of this equation are

$\left ( x+2 \right )\left ( x-1 \right )$

This gives us $x=-2\ or\ x=1$ .

However, if we plug these solutions back into the original equation, does not create an equality. Therefore, x=-2 is an extraneous solution.

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Example Question #5 : How To Find A Rational Number From An Exponent

For some positive integer , if x^3=27 , what is the value of (x+2)^3 ?

Possible Answers:

125

Correct answer:

125

Explanation:

If x^3=27 , then must equal 3 (Note that cannot be -3 because you need it to be positive.

Now, plug x=3 into the new equation (x+2)^3 :

=(3+2)^3

=5^3

=125

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Example Question #571 : Algebra

Factor 2x² - 5x – 12

Possible Answers:

(x + 4) (2x + 3)

(x – 4) (2x – 3)

(x + 4) (2x + 3)

(x - 4) (2x + 3)

Correct answer:

(x - 4) (2x + 3)

Explanation:

Via the FOIL method, we can attest that x(2x) + x(3) + –4(2x) + –4(3) = 2x² – 5x – 12.

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Example Question #1 : How To Use Foil

x > 0.

Quantity A: (x+3)(x-5)(x)

Quantity B: (x-3)(x-1)(x+3)

Possible Answers:

Quantity B is greater

The two quantities are equal

The relationship cannot be determined from the information given

Quantity A is greater

Correct answer:

Quantity B is greater

Explanation:

Use FOIL:

(x+3)(x-5)(x) = (x² - 5x + 3x - 15)(x) = x³ - 5x² + 3x² - 15x = x³ - 2x² - 15x for A.

(x-3)(x-1)(x+3) = (x-3)(x+3)(x-1) = (x² + 3x - 3x - 9)(x-1) = (x² - 9)(x-1)

(x² - 9)(x-1) = x³ - x² - 9x^₊ 9 for B.

The difference between A and B:

(x³ - 2x² - 15x) - (x³ - x² - 9x^₊ 9) = x³ - 2x² - 15x - x³ + x² + 9x - 9

= - x² - 4x - 9. Since all of the terms are negative and x > 0:

A - B < 0.

Rearrange A - B < 0:

A < B

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Example Question #551 : Algebra

Solve for all real values of $\small x$ .

x^3+5x^2-10x=2x^2

Possible Answers:

$2,\ 5$

$0,\ 2,\ -5$

$2,\ -5$

$0,\ 2,\ 5$

Correct answer:

$0,\ 2,\ -5$

Explanation:

x^3+5x^2-10=2x^2

First, move all terms to one side of the equation to set them equal to zero.

x^3+5x^2-2x^2-10x=0

x^3+3x^2-10x=0

All terms contain an $\small x$ , so we can factor it out of the equation.

x(x^2+3x-10)=0

Now, we can factor the quadratic in parenthesis. We need two numbers that add to $\small 3$ and multiply to $\small -10$ .

$-2*5=-10\ \text{and}\ -2+5=3$

x(x-2)(x+5)=0

We now have three terms that multiply to equal zero. One of these terms must equal zero in order for the product to be zero.

$\begin{matrix} x=0 & x-2=0 &x+5=0 \\ x=0 & x=2 & x=-5 \end{matrix}$

Our answer will be $\small x=0,2,-5$ .

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Example Question #1 : Exponents And The Distributive Property

Simplify: $(2x+3)^{2}$

Possible Answers:

$4x^{2}+9$

$4x^{2}-9$

$4x^{2}+12x+9$

$5x^{2}$

$4x^{2}+6x+9$

Correct answer:

$4x^{2}+12x+9$

Explanation:

In order to simplify this expression, you need to use the FOIL method. First rewrite the expression to look like this: (2x+3)(2x+3)

Next, multiply your first terms together: $2x\times2x =4x^{2}$

Then, multiply your outside terms together: $2x\times3=6x$

Then, multiply your inside terms together: $3\times2x=6x$

Lastly, multiply your last terms together: $3\times3=9$

Together, you have $4x^{2}+6x+6x+9$

You can combine your like terms, 6x+6x , to give you the final answer: $4x^{2}+12x+9$

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Example Question #5 : Exponents And The Distributive Property

Use FOIL to simplify the following product:

(x+9)(x-7)

Possible Answers:

x^2+7x+54

x^2+2x-63

x^2-63

x^2+11x+63

7x^2-9x

Correct answer:

x^2+2x-63

Explanation:

Use the FOIL method (first, outside, inside, last) to find the product of:

(x+9)(x-7)

First: $x\cdot x=x^2$

Outside: $-7\cdot x=-7x$

Inside: $9\cdot x=9x$

Last: $-7\cdot 9=-63$

Sum the products to find the polynomial:

x^2-7x+9x-63

x^2+2x-63

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Example Question #1 : How To Use Foil

Simplify:

$2(x^{2}+x)(x-1)$

Possible Answers:

$2x^{3} -2x$

$2x^{3}+2x^{2}-2x-1$

$2x^{3} -x$

$2x^{3}+4x^{2}-2x$

$2x^{3}+2x^{2}-2x$

Correct answer:

$2x^{3} -2x$

Explanation:

To solve this problem, use the FOIL method. Start by multiplying the First term in each set of parentheses: $x^{2} \cdot x =x^{3}$

Then multiply the outside terms: $x^{2}\cdot (-1) =-x^{2}$

Next, multiply the inside terms: $x \cdot x= x^{2}$

Finally, multiply the last terms: $x\cdot (-1) = -x$

When you put the pieces together, you have $2(x^{3} -x^{2} +x^{2}-x)$ . Notice that the middle terms cancel each other out, and you are left with $2(x^{3} -x)$ . When you distribute the two, you reach the answer: $2x^{3} -2x$

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Example Question #552 : Algebra

If (x-3)^2=25 , which of the following could be the value of ?

Possible Answers:

Correct answer:

Explanation:

(x-3)^2=25

Take the square root of both sides.

$x-3=\pm 5$

$x-3=5\ \text{or}\ x-3=-5$

Add 3 to both sides of each equation.

$x=5+3\ \text{or}\ x=-5+3$

$x=8\ \text{or}\ x=-2$

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Example Question #553 : Algebra

Simplify:

$\left ( xyz \right )^{3}+x^{2}y+\left ( xy \right )^{0}+\left ( xy^{\frac{1}{2}} \right )^{2}$

Possible Answers:

$x^{3}y^{3}z^{3}+2x^{2}y$

$x^{3}y^{3}z^{3}+2x^{2}y+1$

$2x^{5}y^{3}z$

$x^{3}y^{3}z^{3}+x^{2}y$

$x^{3}y^{3}z^{3}+x^{2}y+1$

Correct answer:

$x^{3}y^{3}z^{3}+2x^{2}y+1$

Explanation:

$\left ( xyz \right )^{3}+x^{2}y+\left ( xy \right )^{0}+\left ( xy^{\frac{1}{2}} \right )^{2}$

= x³y³z³ + x²y + x⁰y⁰ + x²y

= x³y³z³ + x²y + 1 + x²y

= x³y³z³ + 2x²y + 1

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PSAT Math : Algebra

Study concepts, example questions & explanations for PSAT Math

All PSAT Math Resources

Example Questions

Example Question #5 : How To Find A Rational Number From An Exponent

Example Question #5 : How To Find A Rational Number From An Exponent

Example Question #571 : Algebra

Example Question #1 : How To Use Foil

Example Question #551 : Algebra

Example Question #1 : Exponents And The Distributive Property

Example Question #5 : Exponents And The Distributive Property

Example Question #1 : How To Use Foil

Example Question #552 : Algebra

Example Question #553 : Algebra

All PSAT Math Resources

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