Praxis Core: 1,001 Practice Questions For Dummies
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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

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

    A. 1 B. 4 C. 3 D. 0 E. 2

  2. For the two following functions, what is the value of f(g(1))?

    f(x) = 8x2 – 2x + 12

    g(x) = 3x + 5

    A. 508 B. 415 C. 29 D. 580 E. 18

Answers and explanations

  1. 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:


  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).

About This Article

This article is from the book:

About the book authors:

Carla Kirkland, founder and CEO of the Kirkland Group, an educational consulting firm, has helped educators prepare their students for standardized tests for more than 20 years.

Chan Cleveland, executive vice president of the Kirkland Group, is an English educator who has developed language arts resources for multiple school districts.

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