一題數學的問題 ？

Question

225=2500(0.5-X)^2 ＋3000(0.45-X)^2

我算出的答案是X=0.67和0.27 我不太確定我算的對不對，麻煩各位大大幫我解答，謝謝。

Answer 1

算對,

.67

http://search.yahoo.com/search?p=2500*%280.5-.67%29%5E2%2B3000*%280.45-.67%29%5E2&ei=UTF-8&fr=FP-tab-web-t&fl=0&x=wrt

.27

http://search.yahoo.com/search?p=2500*%280.5-.27%29%5E2%2B3000*%280.45-.27%29%5E2&ei=UTF-8&fr=FP-tab-web-t&fl=0&x=wrt