Hey there! :)
(3x² - 2) + (5x² + 5x - 1)
Remove our parenthesis. Keep in mind that when removing parenthesis, you have to keep a specific rule in mind : positive × positive = positive ; positive × negative = negative ; negative × negative = positive. With that being said, let's remove them! :)
3x² - 2 + 5x² + 5x -1
Combine like terms.
(3x² + 5x²) + (5x) + (-2 - 1) → note that we've added parenthesis into this so that we could clearly distinguish our like terms.
Now, let's simplify.
8x² + 5x + (-3)
Remove our parenthesis.
8x² + 5x - 3
~hope I helped!~