SOLUTION: {{{21n^2-28n-28=0}}} I do not understand how to solve.

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Question 898711: 21n%5E2-28n-28=0
I do not understand how to solve.
Answer by Jc0110(165) About Me  (Show Source):
You can put this solution on YOUR website!
21n%5E2-28n-28=0 ... The whole equation can be simplified by dividing 7.
3n%5E2-4n-4=0 ... This quadratic equation can be solved by using 3 methods, which are Factorization, Quadratic formula or Completing the Square.
Factorization method is being used here.
%283n%2B2%29%28n-2%29=0
n=-2%2F3 or 2