(X-2)(X-3)+2(X+6)(X-5)-3(X^2+7X+13)

问题描述:

(X-2)(X-3)+2(X+6)(X-5)-3(X^2+7X+13)

(x-2)(x-3)+2(x+6)(x-5)-3(x^2+7x+13)
=x^2-5x+6+2(x^2+x-30)-(3x^2+21x+39)
=x^2-5x+6+2x^2+2x-60-3x^2-21x-39
=-24x-93