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Questions 1 - 10
1

Is the following function symmetrical about the y axis (is it an even function)?

Yes

No

Insufficient Information

Not a function

Explanation

For a function to be even, it must satisfy the equality

Likewise if a function is even, it is symmetrical about the y-axis

Therefore, the function is not even, and so the answer is No

2

Find the component form of the vector with

initial point

and

terminal point .

Explanation

To find the vector in component form given the initial and terminal points, simply subtract the initial point from the terminal point.

3

Find the first derivative of

in relation to .

Explanation

To find the derviative of this equation recall the power rule that states: Multiply the exponent in front of the constant and then subtract one from the exponent.

We can work individually with each term:

Derivative of

is,

For the next term:

Derivative of :

So answer is:

Anything to a power of 0 is 1.

For the next term:

Derivative of :

Any derivative of a constant is .

So the first derivative of

is

4

Which of the following is and accurate graph of ?

Varsity2

Varsity3

Varsity4

Varsity5

Varsity6

Explanation

Remember , for .

Step 1, realize where starts: A) observe never occurs, B) zero-out the radical component of ;

C) The resulting point is .

Step 2, find simple points for after :

, so use ;

The next resulting point; .

, so use ;

The next resulting point; .

Step 3, draw a curve through the considered points.

5

Solve the following polynomial for by factoring:

Explanation

The polynomial in the problem is given as follows:

Factoring this polynomial, we would get an expression of the form:

So we need to determine what a and b are. We know we need two factors that when multiplied equal -12, and when added equal -1. If we consider 2 and 6, we could get -12 but could not arrange them in any way that would make their sum equal to -1. We then look at 3 and 4, whose product can be -12 is one of them is negative, and whose sum can be -1 if -4 is added to 3. This tells us that the 4 must be the negative factor and the 3 must be the positive factor, so we get the following:

6

Write an equation in slope-intercept form of the line with the given parametric equations:

Explanation

Start by solving each parametric equation for t:

Next, write an equation involving the expressions for t; since both are equal to t, we can set them equal to one another:

Multiply both sides by the LCD, 6:

Get y by itself to represent this as an equation in slope-intercept (y = mx + b) form:

7

Find the component form of the vector with

initial point

and

terminal point .

Explanation

To find the vector in component form given the initial and terminal points, simply subtract the initial point from the terminal point.

8

Write the parametric equation for the line y = 5x - 3.

x = 5t - 3

y = t

x = t

y = 5t - 3

x = 5t - 3

y = 5t - 3

x = t

y = t

Explanation

In the equation y = 5x - 3, x is the independent variable and y is the dependent variable. In a parametric equation, t is the independent variable, and x and y are both dependent variables.

Start by setting the independent variables x and t equal to one another, and then you can write two parametric equations in terms of t:

x = t

y = 5t - 3

9

Determine the values for the points of inflection of the following function:

Explanation

To solve, you must set the second derivative equal to 0 and solve for x. To differentiate twice, use the power rule as outlined below:

Power Rule:

Therefore:

Remember, the derivative a constant is 0.

Now, set it equal to 0. Thus,

10

Solve this equation and check your answer:

No solution

Explanation

To solve this, first, find the common denominator. It is (n+1)(n-2). Multiply the entire equation by this:

Simplify to get:

Expand to get:

Move all terms to one side and combine to get:

Use the quadratic formula to get:

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