Question

(–7x – 5x4 + 5) – (–7x4 – 5 – 9x)
A. 2x4 + 2x + 8

B. –14x4 + 10x + 10

C. –14x4 – 10x + 10

D. 2x4 + 2x + 10

Answer 1

First distribute the negative into the second set of parentheses. You will end up with:

\((-7x - 5x^4 + 5) + (7x^4 + 5 + 9x)\)

Afterwards, re-arrange the parentheses such that like terms are grouped together:
\((7x^4 - 5x^4) + (9x - 7x) + (5 + 5)\)
Now simplify from here