How do you combine ( 4r^3+3r^4)-(r^4-5r^3)?

1 Answer
Apr 3, 2018

2r^4 + 9r^3

So here's what I did:

Explanation:

(4r^3 + 3r^4) - (r^4 - 5r^3)

First, you distribute the - to everything in its parenthesis:
4r^3 + 3r^4 - r^4 + 5r^3

Now we combine like terms.
4r^3 + 5r^3 = 9r^3

3r^4 - r^4 = 2r^4

So the combined format is 2r^4 + 9r^3.

Hope this helps!