Question

use identities to solve the following (y+7)(y-15)​

Answer 1

Answer:

${y}^{2} - 8y - 105$

Step-by-step explanation:

Identity Used:-

(x+a)(x-b) =

${x}^{2} + ab \: - bx - ab$

Steps:-

${y}^{2} + (7 - 15)y - 7 \times 15$

${y}^{2} - 8y - 105$

Ans.