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x^2 - 7x = 60
x^2 - 7x -60 = 0
-(-7) ± √(-7)^2 - 4(1)(-60)
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2(1)
7 ± √49 + 240
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2
7 ± √289
------
2
7 ± 17
--
2
X1 = (7 + 17)/2 = 24/2 = 12
x2 = (7-17)/2 = -10/2 = -5
Obviamente tomaremos el 12 como el valor de x.
Ancho = x - 7 = 12 - 7 = 5m
Largo = x = 12 m
=Comprobación=
(12)(12-7) = 60
(12)(5) = 60
60 = 60