Hi,

three times a number is added to the square of a number 'n' the result is 10. Find the number

  n^2 + 3n = 10

  n^2 + 3n - 10 = 0

 (n+5)(n-2) = 0

   (n+5) = 0 , n = -5

0r (n-2) = 0 , n = 2 

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