Respuestas

2013-11-13T22:47:06+01:00
Ancho = x

largo = 5 + x

Superficie = largo x ancho = 104

x ( 5 + x ) = 104

5x + x^2 = 104

x^2 + 5x -104 = 0

x = -5 +- raiz 25 + 4 . 104 / 2  = -5+21 /2 = 16 / 2 = 8 ( ancho )

largo = 8 + 5 = 13

area = 8 .13 = 104