Question

Find the sum: (3x^2 + 5x − 8) + (5x^2 − 13x − 5)

A.
8x^2 + 8x − 13
B.
8x^2 − 8x + 13
C.
8x^2 − 8x − 13
D.
8x^2 − x − 13

Answer 1

C.
`\displaystyle 8x^2 - 8x - 13`

Explanation:

All you are doing is combining like-terms:

`\displaystyle 8x^2 - 8x - 13 = [3x^2 + 5x - 8] + [5x^2 - 13x - 5]`

I am joyous to assist you anytime.

Answer 2

C

Explanation:

Given

(3x² + 5x - 8) + (5x² - 13x - 5) ← remove the parenthesis

= 3x² + 5x - 8 + 5x² - 13x - 5 ← collect like terms

= 8x² - 8x - 13 → C