x(5x+4)-(4+5x)=0的步骤
问题描述:
x(5x+4)-(4+5x)=0的步骤
答
5x^2+4x-4-5x=0
5x^2-x-4=0
(5x+4)(x-1)=0
(5x+4)=(x-1)=0
x1=-4/5 x2=1