Answer:
-x^5+3x^4+16x^3+7x^2-3x+6
Step-by-step explanation:
Adding given polynomials:
=(x^5-4x^4+7x^3+8)+ (9x^3+7x^2-10)+(-2x^5+7x^4-3x+8)
=x^5-2x^5-4x^4+7x^4+7x^3+9x^3+7x^2-3x+8+8-10
=-x^5+3x^4+16x^3+7x^2-3x+6
