If-7x5 and -3y4, what is the greatest possible value of (y-x)(x+y)?

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问题 If-7

5 and -3

4, what is the greatest possible value of (y-x)(x+y)?

选项

答案99

解析 The correct answer is -9. The goal would be to make x+y or y-x as big as possible. The biggest x+y is 9(5+4). Then y-x is-1(4-5). -1x9=-9.

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