9(x+1)^2=4(2x-1)^2
问题描述:
9(x+1)^2=4(2x-1)^2
答
(2x-1)^2-4(x+1)(x-1)=9
4x^2-4x+1-4(x^2-1)=9
4x^2-4x+1-4x^2+4-9=0
-4x-8=0
4x=-8
x=-2