问题
解答题
解方程:
(1)(x-1)(x-3)=8
(2)(y-3)2=6-2y.
答案
(1)方程整理为x2-4x-5=0,即(x-5)(x+1)=0,
可得x-5=0或x+1=0,
解得:x1=5,x2=-1;
(2)(y-3)2=6-2y
(3-y)2=2(3-y)
∴(3-y)(1-y)=0,
解得:y1=3,y2=1.
解方程:
(1)(x-1)(x-3)=8
(2)(y-3)2=6-2y.
(1)方程整理为x2-4x-5=0,即(x-5)(x+1)=0,
可得x-5=0或x+1=0,
解得:x1=5,x2=-1;
(2)(y-3)2=6-2y
(3-y)2=2(3-y)
∴(3-y)(1-y)=0,
解得:y1=3,y2=1.