9m2+ 9mn- 4n2
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2mn + 4n2 and 5m2 - 7mn
4n2 + 5m2 - 5mn
Oh, dude, 7m times n is just 7m times n. It's like when you have seven apples and you multiply them by the number of apples you have... you just get 7 times the number of apples. So, yeah, 7m times n equals 7mn. Easy peasy, lemon squeezy.