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-84 = ( x + 5)x
-84 = x^2 + 5x
-x^2 + 5x = 84
-x^2 + 5x - 84 = 0
-(x + 12)(x - 7) = 0
-x + 12 = 0 x - 7 = 0
-x = -12 x = 7
así que el numero es 7
84 = ( x + 5)x
84 = x^2 + 5x
x^2 + 5x = 84
x^2 + 5x - 84 = 0
(x + 12)(x - 7) = 0
x + 12 = 0 x - 7 = 0
x = -12 x = 7
El número es 7