Evaluate (4x^2+8)+(-8x^2-5x+2)

$(4 x^{2} + 8) + (- 8 x^{2} - 5 x + 2)$

Remove parentheses.

$4 x^{2} + 8 - 8 x^{2} - 5 x + 2$

Subtract $8 x^{2}$ from $4 x^{2}$ .

$- 4 x^{2} + 8 - 5 x + 2$

Add $8$ and $2$ .

$- 4 x^{2} - 5 x + 10$