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ancho = x
A= x(x+3)
PLANTEO DE LA ECUACIÓN
x(x+3) = 2x²
x² +3x = 2x²
2x² -x² -3x =0
x² -3x =0
x(x-3)=0
x=0 x-3 = 0
x= 3
RESPUESTA
Las dimensiones son
largo = x+3 = 3+3 = 6
ancho = x = 3