SOLUTION: I am working on an equation that I am to answer in standard form. Ok I understand that. When I went to check my answer on an online problem solver the answer differs from what I go

Question 478640: I am working on an equation that I am to answer in standard form. Ok I understand that. When I went to check my answer on an online problem solver the answer differs from what I got and I do not see why.
(6a^3+2a^2-7)+(2a^3-a+7)
here is what i did:
6a^3 + 2a^3 = 8a^3
2a^2 + (-a) = a
(-7) + 7 = 0
so my answer is 8a^3 +a
from problem solvers the answer is : 8a^3 +2a^2-a
which is correct?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
(6a^3 + 2a^2 - 7)+(2a^3 - a + 7)
Combine like terms
6a^3 + 2a^3 + 2a^2 - a + 7 + 7
8a^3 + 2a^2 - a
RELATED QUESTIONS
well i dont not understand any questions that look like this : "... (answered by stanbon)

I have one more equation that I am having problems with. Once again, the answer I came... (answered by dolly)

I am working with slopes and the issue I have is finding slopes when you are only given... (answered by Mathtut)

Hello, I am working on a series of questions with the equation y-3=3(x+1). I have the... (answered by Alan3354)

Hi! I'm working on some Conic Section problems, and do ok when they are centered at zero. (answered by venugopalramana)

I already have an answer to this, but just want to make sure I did it right. The problem... (answered by Alan3354,Earlsdon)

Hello: I am asked to simplify (3x)^2/4y My answer: 9x^2/4y Answer given by the... (answered by josmiceli)

I am doing a problem on my math homework that says Write equation of line that passes... (answered by Alan3354)

How do I properly graph this equation on algebra.com? x-4y=-8 I know that rise=2... (answered by Theo)