Question

Упростите выражение: (у – 4) (у + 2) – (у – 2)^2

Answer 1

(y-4)(y+2)-(y-2)2= (y-2)(y-4)-2 = (y-2)(y-4-2) = (y-2)(y-6)

Answer 2

(y-4)(y+2) - (y-2)² = y²-4y+2y-8 -(y²-4y+4)=y²-2y-8-y²+4y-4=2y-12