Hey there!
(2y² + 8y - 7) - (- 3y + 3)
Simplify the subtraction symbol. This'll change the signs of -3y and +3.
(2y² + 8y - 7) + 3y - 3
Remove the parenthesis.
2y² + 8y - 7 + 3y - 3
Combine like terms: 8y and 3y
2y² + 11y - 7 - 3
Combine like terms: -7 and -3
2y² + 11y - 10
This is the fully simplified expression.
Hope this helps!