Question

How do you subtract `(3y^2-9y)-(-5y^2+7y-7)`?

Answer 1

`(3y^2-9y)-(-5y^2+7y-7)=8y(y-2)+7`

Explanation:

`(3y^2-9y)-(-5y^2+7y-7)=3y^2-9y+5y^2-7y+7`

`(3y^2-9y)-(-5y^2+7y-7)=8y^2-16y+7`

`(3y^2-9y)-(-5y^2+7y-7)=8y(y-2)+7`