SOLUTION: The square of a certain number is 112 less than 13 times the original number find the number

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Question 1176291: The square of a certain number is 112 less than 13 times the original number find the number
Answer by josgarithmetic(39617) About Me  (Show Source):
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n%5E2=-112%2B13n

n%5E2-13n%2B112=0

discriminant, %28-13%29%5E2-4%2A112=169-448=-279
-9%2A31


n=%2813%2B-+i%2A3%2Asqrt%2831%29%29%2F2
Look for any mistakes in the solution method.