ISEE Word Problems Question 263: Answer and Explanation
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Question: 263
12. What is the minimum value of y if y = 3x2 – 4 for –3 ≤ x ≤ 2 ?
- A. – 7
- B. – 4
- C. 8
- D. 23
Correct Answer: B
Explanation:
B
The smallest value of y is not necessarily determined by the smallest value of x, so try values of x on the ends and in the middle. If x = 2, then 3(2)2 – 4 = 8. If x = –3, then 3(–3)2 – 4 = 23. If x = 0, then 3(0)2 – 4 = –4. No value of x in the specified range will yield y = –7.