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HomeAccuplacerMathematicsComposition of Functions › Let f(x) = 3x - 1 and g(x) = x squared + 2. What…

Let f(x) = 3x - 1 and g(x) = x squared + 2. What is f(g(2))?

AIt equals 17
BIt equals 27
CIt equals 25
DIt equals 11
Answer & Solution
Correct answer: A. It equals 17
1. A composition works from the inside out, so evaluate g first. 2. Substituting 2 into g gives 2 squared plus 2. 3. That is 4 plus 2, which is 6. 4. Now feed 6 into f as its input. 5. Substituting 6 into f gives 3 times 6 minus 1. 6. That is 18 minus 1, which is 17. 7. The answer 27 evaluates g(f(2)) instead, reversing the order of the two rules. 8. The answer 25 squares the result of f rather than composing in the stated order. 9. The answer 11 stops at f(2) and never uses g at all. _Source: OpenStax College Algebra (CC BY 4.0), section 3.4 Composition of Functions_
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