15. Find the sum of 4x^2-5 and -2x^2+10 ) -8x^2-50 6x^2-15 2x^2+5 -x^2-8

To find the sum of $$4x^{2}-5$$ and $$-2x^{2}+10$$ , we need to add the corresponding terms together.

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

Combine like terms:

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

Simplify:

$$2x^{2} + 5$$

Therefore, the correct answer is $$2x^{2}+5$$ .