# Practice with Functions

I need some help to push me through with functions. (Please see the Attached Questions File)

5. Perform the requested operation or operations.

f(x) = 2x - 9, g(x) = 4x - 4

Find (f - g)(x)

Answer. -2x - 5

6. Compare the graph of the given quadratic function f with the graph of y = x2

f(x) = (x - 8)2 + 4

Answer. a translation 8 units right and 4 units up

Solve the problem

Find (f Â° g)(3) when f(x) = -5x + 2 and g(x) = 8x2 + 9x + 7

Answer: -528

8. Compute and simplify the difference quotient

f(x + h) - f(x)

H

, h â‰ 0.

Answer: 4

10. Consider the function h as defined. Find functions f and g so that (f Â° g)(x) = h(x).

h(x) = 10/x^2 +4

answer. f(x) = x + 4, g(x) = 10/x^2

11. Solve the problem.

Find (f Â°g)(-6) when f(x) = 4x + 4 and g(x) = 6x2 - 3x - 6.

Answer: 916

13. Determine whether or not the function is one-to-one.

15. Perform the requested operation or operations.

f(x) = 9x - 4, g(x) = 6x - 6

Find (f - g)(x).

Answer: 3x + 2

16. Graph the basic function using a solid line and the transformed function using a dotted line.

y = -3 |x|

20. Solve the problem

Select the equation that describes the graph shown

A. y = (x + 2)2- 4

B. y = (x + 4)2 + 2

C. y = (x - 4)2 + 2

D. y = x2 - 4

https://brainmass.com/math/graphs-and-functions/practice-functions-184677

#### Solution Preview

The solution file is attached.

5. Perform the requested operation or operations.

f(x) = 2x - 9, g(x) = 4x - 4

Find (f - g)(x)

(f - g)(-x) = 2x - 9 - (4x - 4) = 2x - 9 - 4x + 4 = -2x - 5

Answer. -2x - 5

6. Compare the graph of the given quadratic function f with the graph of y = x2

f(x) = (x - 8)2 + 4

.

Answer. a translation 8 units right and 4 units up (This answer is correct!)

Solve the problem

Find (f Â° g)(3) when f(x) = -5x + 2 and g(x) = 8x2 + 9x + 7

(f O ...

#### Solution Summary

Neat and Step-by-step Solutions to all questions. Graphs (if any) are also included.