(3х - 2)(2х - 1) - (5х+2)(3х-4)=
= 3х*2х + 3х * (-1 ) - 2*2х - 2 *(-1) - (5х*3х + 5х*(-4) + 2*3х + 2*(-4) ) =
= 6х² - 3х - 4х + 2 - (15х² - 20х + 6х - 8) =
= 6х² - 7х + 2 - 15х² + 14х + 8 =
= (6х² - 15х²) + (-7х + 14х) + (2+8) =
= - 9х² + 7х + 10
(4х -3)(3х+2) - (5х+2)(3х-4) =
= 4х*3х +4х*2 -3*3х -3*2 - (5х*3х +5х*(-4) +2*3х +2*(-4) ) =
= 12х² +8х -9х -6 - (15х² -20х +6х -8) =
= 12х² -х -6 -15х²+14х +8 =
= -3х² +13х +2