SOLUTION: if you square positive number then add twice the number to the result, you will get 80. What is the number?

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Question 908915: if you square positive number then add twice the number to the result, you will get 80. What is the number?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
number, n.

n%5E2%2B2n=80----best attempt to put description into equation
n%5E2%2B2n-80=0
n=%28-2%2B-sqrt%284%2B4%2A80%29%29%2F2
n=%28-2%2Bsqrt%28324%29%29%2F2
n=%28-2%2B18%29%2F2
highlight%28n=8%29