已知(3x+1)(2x-1)-(x+3)(5x-6)=x^2-10x+m,则m=

问题描述:

已知(3x+1)(2x-1)-(x+3)(5x-6)=x^2-10x+m,则m=

(3x+1)(2x-1)-(x+3)(5x-6)
=(6x^2-x-1)-(5x^2+9x-18)
=6x^2-x-1-5x^2-9x+18
=x^2-10x+17
所以m=17