4〔X-〕²-9〔X+1〕²=0 怎么算啊

问题描述:

4〔X-〕²-9〔X+1〕²=0 怎么算啊

9(X-2)2 -16(X +1)2 = 0
[3(X-2)] 2 - [4(X +1)] 2 = 0
(3X-6 2)2 - (4×4)2 = 0
[(3×1-6)+(4×4)] [(3×1-6) - (4×4)] = 0
(7X- 2)(-X-10)= 0
然后:7倍-2 = 0或-x-10 = 0
得到:X = 2/7或x = -10