Need help evaluating and simplifying

Question

Evaluate the function f(x)=9x+9 at the given values of the independent variable and simplify.

A. f(-5) B. f(x+4) C. f(-x)

Answer 1

The equation is f(x)=9x+9

A)

Step 1: Plug in -5 into x

f(-5) = 9(-5)+9

Step 2: Simplify 9*(-5)=-45

f(-5) = -45+9

Step 3: Evaluate

f(-5) = -36

B)

Step 1: Plug in x+4 into x

f(x+4) = 9(x+4) + 9

Step 2: Use distributive property

f(x+4) = 9x+36+9

Step 3: Evaluate

f(x+4) = 9x+45

C)

Step 1: plug in (-x) into x

f(-x) = 9(-x) + 9

Step 2: Simplify

f(-x) = -9x +9