Polynomial Functions

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Algebra II › Polynomial Functions

Questions 1 - 10
1

For the graph below, match the graph b with one of the following equations:

Parabola

None of the above

Explanation

Starting with

moves the parabola by units to the right.

Similarly moves the parabola by units to the left.

Hence the correct answer is option .

2

What transformations have been enacted upon when compared to its parent function, ?

vertical stretch by a factor of 4

horizontal compression by a factor of 2

horizontal translation 3 units right

vertical stretch by a factor of 4

horizontal stretch by a factor of 2

horizontal translation 3 units right

vertical stretch by a factor of 4

horizontal stretch by a factor of 2

horizontal translation 6 units right

vertical stretch by a factor of 4

horizontal compression by a factor of 2

horizontal translation 6 units right

Explanation

First, we need to get this function into a more standard form.

Now we can see that while the function is being horizontally compressed by a factor of 2, it's being translated 3 units to the right, not 6. (It's also being vertically stretched by a factor of 4, of course.)

3

For the graph below, match the graph b with one of the following equations:

Parabola

None of the above

Explanation

Starting with

moves the parabola by units to the right.

Similarly moves the parabola by units to the left.

Hence the correct answer is option .

4

What transformations have been enacted upon when compared to its parent function, ?

vertical stretch by a factor of 4

horizontal compression by a factor of 2

horizontal translation 3 units right

vertical stretch by a factor of 4

horizontal stretch by a factor of 2

horizontal translation 3 units right

vertical stretch by a factor of 4

horizontal stretch by a factor of 2

horizontal translation 6 units right

vertical stretch by a factor of 4

horizontal compression by a factor of 2

horizontal translation 6 units right

Explanation

First, we need to get this function into a more standard form.

Now we can see that while the function is being horizontally compressed by a factor of 2, it's being translated 3 units to the right, not 6. (It's also being vertically stretched by a factor of 4, of course.)

5

Let , , and . What is ?

Explanation

When solving functions within functions, we begin with the innermost function and work our way outwards. Therefore:

and

6

Let , , and . What is ?

Explanation

When solving functions within functions, we begin with the innermost function and work our way outwards. Therefore:

and

7

Let , , and . What is ?

Explanation

This problem relies on our knowledge of a radical expression equal to . The functions are subbed into one another in order from most inner to most outer function.

and

8

Let , , and . What is ?

Explanation

This problem relies on our knowledge of a radical expression equal to . The functions are subbed into one another in order from most inner to most outer function.

and

9

Write the transformation of the given function flipped, and moved one unit to the left:

Explanation

To transform a function horizontally, we must add or subtract the units we transform to x directly. To move left, we add units to x, which is opposite what one thinks should happen, but keep in mind that to move left is to be more negative. To flip a function, the entire function changes in sign.

After making both of these changes, we get

10

Shift to up two units. What is the new equation?

Explanation

We will need to determine the equation of the parabola in standard form, which is:

Use the FOIL method to expand the binomials.

Shifting this up two units will add two to the value of .

The answer is:

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