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标题: 天山 7-5 [打印本页]

作者: diatomss    时间: 2005-5-26 06:41     标题: 天山 7-5

Q5,

If b, c and d are constants and x^2+bx+c=(x+d)^2 for all values of x, what is the value of c?

(1) d=3

(2) b=6

答案是D 我的是E

(1)(2)各自是算不出来c的呀?即便加起来,x这个变量也不知道,怎么得出D答案的?


作者: kuuiytt    时间: 2005-5-26 06:46

if it's for all values of x, then c = d^2 b = 2d from either 1 or 2, you can work out the value of c.






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