I am doing homework on Combine Like terms. But I came to a problem that i just need to know the "how to" on this one.

-2n - (9 - 10n)

Now the answer is 8n - 9

I got at first -12n - 9

Can someone just explain the proper steps for this problem?

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- August 6th 2011, 09:58 PMqueequeegHow to combine this problem
I am doing homework on Combine Like terms. But I came to a problem that i just need to know the "how to" on this one.

-2n - (9 - 10n)

Now the answer is 8n - 9

I got at first -12n - 9

Can someone just explain the proper steps for this problem? - August 6th 2011, 10:51 PMabhishekkgpRe: How to combine this problem
- August 6th 2011, 11:06 PMbenny92000Re: How to combine this problem
Remember that two negatives equals a positive. The "-10" is negative, so when you subtract from a negative 10 you get positive 10.