Question

add
(2b^4-2b^3+5b^2+13b-9)+
(b^5+9b^3+2b^2-5b+4)+
(-5b^4+b^2-3b-4)

Answer 1

Adding Like terms.
\[b^5-3 b^4+7 b^3+8 b^2+5 b-9 \]

Answer 2

Can add like terms b^5's with b^5's
b^4's with b^4's etc.

b^5
2b^4 - 5b^4
-2b^3 + 9b^3
5b^2 + 2b^2 + b^2
13b - 5b - 3b
-9 + 4 - 4

Adding each of these would get you the answer above.