(x+1)(x-1)+2(x+3)=8
问题描述:
(x+1)(x-1)+2(x+3)=8
答
(x+1)(x-1)+2(x+3)=8,
x^2-1+2x+6=8,
x^2+2x-3=0,
(x+3)(x-1)=0,
x=-3或1.