It is: 2n^2 -5n -42 equals (2n+7)(n-6) when factored
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3n + 2n = 7 + 4n 5n = 7 + 4n 5n - 4n = 7 n = 7
Oh, dude, that's like adding 2 apples to 3 apples, you know? So, if you have 2n and then add 3n, you end up with 5n. It's like math, but with letters instead of numbers.
Subract 5n from both sides and you get 9=-3n, then divide bother sides by -3 and you get n= -3
A variable comes after the number 2n+5n=7n
(5n - 20) It's a binomial expression in 'n'. Its numerical value depends on the numerical value of 'n'.