问题
解答题
解方程
(1)x2+x=0;
(2)x2+3x-4=0.
答案
(1)x2+x=0,
x(x+1)=0,
x=0,x+1=0,
x1=0,x2=-1.
(2)x2+3x-4=0,
(x+4)(x-1)=0,
x+4=0,x-1=0,
x1=-4,x2=1.
解方程
(1)x2+x=0;
(2)x2+3x-4=0.
(1)x2+x=0,
x(x+1)=0,
x=0,x+1=0,
x1=0,x2=-1.
(2)x2+3x-4=0,
(x+4)(x-1)=0,
x+4=0,x-1=0,
x1=-4,x2=1.