Question

(y-7)(y+12) simplify ......

Answer 1

$(y - 7)(y + 12) \\ = {y}^{2} + 12y - 7y - 84 \\ = {y}^{2} + 5y - 84$

Answer 2

(Y-7) ( Y+12)

Y(Y+12)-7(Y+12)

Y^2+12Y-7Y-84

Y^2+5Y-84

Factorization :

Y^2+7Y-12Y-84

Y(Y+7)-12(Y+7)

(y-12) (y+7)

Y-12=0. Y+7=0

Y = 12. Y=-7