(x^2+5x+3)*(x^2+5x-2)-6

问题描述:

(x^2+5x+3)*(x^2+5x-2)-6

(x^2+5x+3)*(x^2+5x-2)-6
=(x²+5x)²+(x²+5x)-6-6
=(x²+5x)²+(x²+5x)-12
=(x²+5x+4)(x²+5x-3)
=(x+1)(x+4)(x²+5x-3)