题目内容
选用适当的方法解下列方程:
(1)(x-2)2-9=0
(2)x2+2x=3.
(1)(x-2)2-9=0
(2)x2+2x=3.
(1)移项得:(x-2)2=9,
x-2=±3,
x1=5,x2=-1;
(2)x2+2x-3=0,
(x+3)(x-1)=0,
x+3=0,x-1=0,
x1=-3,x2=1.
x-2=±3,
x1=5,x2=-1;
(2)x2+2x-3=0,
(x+3)(x-1)=0,
x+3=0,x-1=0,
x1=-3,x2=1.
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