(8x²+6x²+3x-7) + (3x²+8x²+7x-8)
First remove the parenthesis before you remove the parenthesis solve each first
=(8x²+6x²+3x-7)
=14x²+3x-7
And the other one
= (3x²+8x²+7x-8)
=11x²+7x-8
And then after that you can solve now
14x²+3x-7
+ 11x²+7x-8
= 25x²+10x15
