Question

simplify.
\\((-3y^2 - 2y + 7) + (3y^2 - 7y + 9) - (-4y^2 - 9y + 5)\\)

Explanation:

Step1: Remove parentheses

$-3y^2 - 2y + 7 + 3y^2 - 7y + 9 + 4y^2 + 9y - 5$

Step2: Group like terms

$(-3y^2 + 3y^2 + 4y^2) + (-2y - 7y + 9y) + (7 + 9 - 5)$

Step3: Combine like terms

$4y^2 + 0y + 11$

Answer:

$4y^2 + 11$