7 multiplied by the value of n.
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Well, darling, in the world of math, 7n simply means "7 times n." It's like saying you have 7 groups of something, each group containing n items. So, if you're feeling adventurous, go ahead and substitute a number for n and see what kind of mathematical mischief you can get up to!
7n(n−1)
11
4n3 - 12n2 - 7n + 9
It means the radius squared.
100m^2-49n^2 (10m+7n)(10m-7n) the middle term cancels out.