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x=y+2
xy=(x+4)(y+4)-72 sustituimos x=y+2
(y+2)y=(y+2+4)(y+4)-72
y²+2y=(y+6)(y+4)-72
y²+2y=y²+10y+24-72
y²-y²+2y-10y= -48
-8y= -48
y= -48/-8
y=6
si y=6
x=y+2
x=6+2
x=8
las dimensiones son :
largo mide 8 cm
ancho mide 6 cm