(x^2-5x)(x^2-5x-10)-56怎么做?

问题描述:

(x^2-5x)(x^2-5x-10)-56怎么做?

(x^2-5x)(x^2-5x-10)-56
=(x^2-5x)(x^2-5x-10)-14*4
=(x^2-5x-14)(x^2-5x+4)
=(x-7)(x+2)(x-4)(x-1)