解方程:(x²-x)²-4(x²-x)-12=0
问题描述:
解方程:(x²-x)²-4(x²-x)-12=0
答
设y=x^2-x,原方程可简化为,y^2-4y-12=0(y+2)(y-6)=0y=-2或y=6即x^2-x=-2或x^2-x=6解第一个:x^2-x=-2x^2-x+2=0(x-1/2)^2+3/4=0(x-1/2)^2=-3/4无实数解;解第二个:x^2-x-6=0(x+2)(x-3)=0x=-2或X=3综上:x=-2或3...