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Is this the correct answer for my math equation?
On one of my tests in Algebra it said to simplify this problem: 6n^2 - 4m^2 - 2n^2 + 9m^2
I'm not very good at this, so I got: 4n - 13m^4
My teacher wrote this as the right answer: 4n^2 - 15m^2
What I don't understand is how she got 15. Any explanation for this please?
2 Answers
- GuillermoLv 79 years agoFavorite Answer
6n^2 - 4m^2 - 2n^2 + 9m^2 =
(6n^2 - 2n^2) + ( - 4m^2 + 9m^2) = 4n^2 + 5m^2, answer!
- Anonymous9 years ago
6n - 2n = 4n
9m - 4m = 5m
So its (5m + 4n)^2
