解方程3(x-1)²-17(1-x)=28

问题描述:

解方程3(x-1)²-17(1-x)=28

3(x-1)²-17(1-x)=28
3x²-6x+3-17+17x=28
3x²+11x-42=0
(3x-7)(x+6)=0
x=7/3或x=-6