Oh, dude, like, 3n times n is just 3n^2. It's like, you take 3 times n, and then multiply that by n again. So, it's basically n squared, but with a 3 in front. Easy peasy, lemon squeezy.
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3n x 3n = 9n if 9n = 36 then n = 36/9 = 4
The expression would be abs(4n - 3n) where (4n - 3n) could be simplified to 1n or n. When n is positive, the result is n when n is negative, the result is -n (which will be positive).
Let the numbers be 'n' & '3n' Hence their sum is n + 3n = 84 4n = 84 n = 21 & 3n = 63 ( 3 x 21)
The coefficient of '3n' is 3; n is the VARIABLE; n is often chosen for 'number'.
When n = 4, 3n = 3*4 = 12