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Ancho = y
P = 2x+2y
A = xy
PLANTEO DE LAS ECUACIONES
(1) x = y+4
(2) xy = 2x+2y+92; sustituyendo la ec 1 en la 2
xy = 2x+2y+92
( y+4)y = 2( y+4)+2y+92
y²+4y = 2y+8+2y+92
y²+4y-2y-2y-8-92=0
y²-100 =0
y² =100
y = √100
y = 10 m (ancho)
x = y+4 = 10+4
x = 14 m (largo)