Question

What is the sum or difference?

a. 5x4 + 4x4
b. 12x5y − 9x5y
A. a. 9x4 b. 3x5y
B. a. 20x16 b. −108x25y2
C. a. 9x8 b. 3x10y
D. a. 9x16 b. 3x25y2

Answer 1

It would be A hope this helped!

Answer 2

A. a. 9x^4 b. 3x^5y

Explanation:

a. 5x^4 + 4x^4

Since these are to the same power, they are like terms and we can add them

9x^4

b. 12x^5y − 9x^5y

Since these are to the same power, they are like terms and we can subtract them.

3x^5y