# Practice Math Questions for Praxis: Solving Functions

If you enjoy solving functions (and why wouldn’t you?), then you’ll have a great time on the Praxis Core exam. The following practice questions will help you put the *fun* into “function” by asking you to first solve a simple function, and then to find the value of two functions combined!

## Practice questions

- If
*f*(*x*) =*x*– 2, what is the value of*f*(3)?**A.**1

**B.**4

**C.**3

**D.**0

**E.**2 - For the two following functions, what is the value of
*f*(*g*(1))?*f*(*x*) = 8*x*^{2}– 2*x*+ 12*g(x)*= 3*x*+ 5**A.**508

**B.**415

**C.**29

**D.**580

**E.**18

## Answers and explanations

- The correct answer is Choice
**(A).**

Because*f*(3) replaces the*x*in*f*(*x*) with 3, put 3 in for*x*in*x*– 2: - The correct answer is Choice
**(A).**

First, find the value of*g*(1):Because

*g*(1) is 8,*f*(*g*(1)) is*f*(8):Therefore,

*f*(*g*(1)) is 508, Choice (A).