问题
解答题
解方程:
(1)(x+1)(x-1)=2(x+1);
(2)x2+2x-3=0.
答案
(1)移项得(x+1)(x-1)-2(x+1)=0;
(x+1)(x-1-2)=0
x1=-1,x2=3
(2)(x+3)(x-1)=0
x1=-3,x2=1
解方程:
(1)(x+1)(x-1)=2(x+1);
(2)x2+2x-3=0.
(1)移项得(x+1)(x-1)-2(x+1)=0;
(x+1)(x-1-2)=0
x1=-1,x2=3
(2)(x+3)(x-1)=0
x1=-3,x2=1