Respostas

2014-04-16T13:26:54-03:00
X^2 + x = 56
X^2 +x - 56 =0
Aplicando bhaskara.. Delta = b^2 -4ac

Delta = 225

X = (-b +- raiz de delta)/ 2a

X = (-1 +- 15)/2

x1= -8
x2= 7
2014-04-16T13:26:54-03:00
Número = x 

x + x^2 = 56 

x^2 + x - 56 = 0 

delta = 1 + 224 

delta = 225 
x' = (-1 + 15)/2 = 7 

x" = ( -1 -15) /2 = -8