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If-7x5 and -3y4, what is the greatest possible value of (y-x)(x+y)?
If-7x5 and -3y4, what is the greatest possible value of (y-x)(x+y)?
admin
2013-05-19
23
问题
If-7
x
5 and -3
y
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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