Respuesta :

Let, the number = n
Then, n² - 15 = 2n
n² - 2n - 15 = 0
n² + 3n - 5n - 15 = 0
n(n + 3) -5(n + 3) = 0
(n+ 3) (n - 5) = 0
n  = -3 OR n = 5

In short, Your Answer would be: 5 & -3

Hope this helps!