The solution is 10x² + 7x - 1
Step-by-step explanation:
(8x² + 10x - 10) - (-2x² + 3x - 9) = 8x² + 10x - 10 + 2x² - 3x + 9
= 10x² + 7x - 1
[tex]\huge\bold\purple{ 10x^2+7x-1 }[/tex]