SAT Math Grid-Ins Question 120: Answer And Explanation - Crack SAT

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Question: 120

2. If g(x) = x2 + 2x + 9, what is g(5) – g(–1)?

Correct Answer: 36

Explanation:

36

Difficulty: Easy

Category: Passport to Advanced Math / Functions

Strategic Advice: When evaluating a function, substitute the value inside the parentheses for x in the equation.

Getting to the Answer: Evaluate the function at x = 5 and at x = –1. Then subtract the second output from the first. Note that this is not the same as first subtracting 5 – (–1) and then evaluating the function at x = 6.

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