问题
解答题
解方程:(1)(x-1)2=3x-3 (2)2x2-2x-3=0
答案
(1)(x-1)2=3x-3
(x-1)2-3x+3=0
(x-1)2-3(x-1)=0
(x-1)(x-4)=0
x1=1,x2=4;
(2)2x2-2x-3=0
∵a=2,b=-2,c=-3
∴x=-b± b2-4ac 2a
=2± 4+24 4
=
.1± 7 2
解方程:(1)(x-1)2=3x-3 (2)2x2-2x-3=0
(1)(x-1)2=3x-3
(x-1)2-3x+3=0
(x-1)2-3(x-1)=0
(x-1)(x-4)=0
x1=1,x2=4;
(2)2x2-2x-3=0
∵a=2,b=-2,c=-3
∴x=-b± b2-4ac 2a
=2± 4+24 4
=
.1± 7 2