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Si cada lado mide 2x + 3y
L = 2x + 3y
Área = L x L
Entonces
Área = (2x+3y) (2x+3y)
A = (2x+3y)^2
A = 4x^2 + 12xy + 9y^2
Área es = 4x^2 + 12xy + 9^2