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2° lado = 3x + 11
Área = (x + 3)(3x + 11) = 3x² + 11x + 9x + 33 = 3x² + 20x + 33
Si: x = 2
Área = 3x² + 20x + 33 = 3(2)² + 20(2) + 33 = 85cm