Question

Combine like terms.

Answer 1

$= 7 {y}^{2} - 3y + 8 {y}^{2} - 8y \\ = 15 {y}^{2} - 11y$

Answer 2

(7y^2-3y)+(8y^2-8y)

combining like terms we get,

7y^2+8y^2-3y-8y

15y^2-11y