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?
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.
欢迎光临 国际顶尖MBA申请交流平台--TOPWAY MBA (http://forum.topway.org/) | Powered by Discuz! 7.2 |