Question

(y+2)(y-1)+(-y)²=(2y-1)(y+2)-4

Answer 1

$y^{2} +y-2+ y^{2} =2 y^{2} +3y-2-4$
$2 y^{2} +y-2=2 y^{2} +3y-6$
4=2y
2=y
comprobacion:
(2+2)(2-1)+$(-2)^{2}$=(2.2-1)(2+2)-4
4+4=12-4
8=8