Question

Choose the correct simplification of (5x3 − 5x − 8) + (2x3 + 4x + 2).
A. 7x3 + x + 6
B. 3x3 − 9x − 10
C. 3x3 + 9x + 10
D. 7x3 − x − 6

Answer 1

just add the ones with equal exponentials.

Answer 2

it will turn out to be D.

Answer 3

Do what @nickymarden says and combine the like terms. Check for yourself but I think its D as well:)