(у-4)(у+2)-(у-2)²= 2х(2х+3у)-(х+у)²=

Question

(у-4)(у+2)-(у-2)²=
2х(2х+3у)-(х+у)²=

Answer 1

Y^2-8-4y-8-(y^2-4y+4)=y^2-8-4y-8-y^2+4y-4=-16-4=-20

4x^2+6xy-(x^2+2xy+y^2)=3x^2+4xy-y^2