ISEE Word Problems Question 190: Answer and Explanation

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Question: 190

1. What is the maximum value for y if y = 3x² + 2 for –3 ≤ x ≤ 2?

A. 29
B. 14
C. 7
D. –25

Correct Answer: A

Explanation:

The answer is A

The largest value of y is not necessarily determined by the largest value of x, so try values of x on the ends and in the middle. If x = 2, then 3(2)² + 2 = 14. If x = -3, then 3(-3)² + 2 = 29. If x = 0, then 3(0)² + 2 = 2. Thus, 29 is the largest value.

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