Answer:
1) D. 10x^6 + 10x^2 - 6x^3 - 6
2) B. 5x^3 + 11x^2 - 2x - 8
Step-by-step explanation:
(7x^6 + 10 x^2 - 10) + (3x^6 - 6x^3 + 4)
= 7x^6 + 10x^2 - 10 + 3x^6 - 6x^3 + 4
= 7x^6 + 3x^6 - 6x^3 + 10x^2 - 10 + 4
= 10x^6 - 6x^3 + 10x^2 - 6
= 10x^6 + 10x^2 - 6x^3 - 6
(5x^2 + x - 4)(x + 2)
= 5x^3 + 10x^2 + x^2 + 2x - 4x - 8
= 5x^3 + 11x^2 - 2x - 8
