问题
解答题
解一元二次方程:
(1)x2-x=0;
(2)x2+5x-14=0.
答案
(1)x2-x=0,
x(x-1)=0,
x=0,x-1=0,
解得:x1=0,x2=1.
(2)x2+5x-14=0,
分解因式得:(x+7)(x-2)=0,
x+7=0,x-2=0,
解得:x1=-7,x2=2.
解一元二次方程:
(1)x2-x=0;
(2)x2+5x-14=0.
(1)x2-x=0,
x(x-1)=0,
x=0,x-1=0,
解得:x1=0,x2=1.
(2)x2+5x-14=0,
分解因式得:(x+7)(x-2)=0,
x+7=0,x-2=0,
解得:x1=-7,x2=2.