(2х+3)(3х-2)-(5х+3)(х+4)-х(20-х ) решите срочно

Question

(2х+3)(3х-2)-(5х+3)(х+4)-х(20-х ) решите срочно

Answer 1

(2х+3)(3х-2)-(5х+3)(х+4)-х(20-х)=
=6х²-4х+9х-6-5х²-20х-3х-12-20х+х²=2х²-38х-18=2х(х-19)-18