(6x^2-x+10-(-4+2x^2+8x)
I assume this is :
(6x^2-x+10) - (-4+2x^2+8x) if so........distribute the negative over the terms in the parentheses
6x^2 - x + 10 + 4 - 2x^2 - 8x combine like terms
4x^2 - 9x + 14
