Answer: 5x^3+28x+8
Explanation:
There are multiple steps to this:
First perform distributive property to each set of parentheses:
ie. 6x(x+5) = 6x*x + 6x*5= 6x^2+30x
6x^2+30x+8-2x-6x^2+5x^3
Combine like terms giving you your answer:
5x^3+28x+8
Hope this helps :)