Question

Combine like terms. (-3^2-7y-9)-(4y^2+6y+9)

Answer 1

`-7y^2-13y-18`

Explanation:

`(-3y^2-7y-9)-(4y^2+6y+9)`

To combine like terms we need to remove the parenthesis

Multiply negative inside the second parenthesis

`-3y^2-7y-9-4y^2-6y-9`

Now combine like terms

The terms that has same variable are like terms

-3y^2 and -4y^2 are like terms so its -7y^2

-7y and -6y are like terms so it becomes -13y

-9 and -9 are like terms so it becomes -18

Answer is
`-7y^2-13y-18`