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= 144 - (a²+ 2ab +b²)
= 144 -a² -2ab -b²
144 - (a + b)²
SE EXTRAE LA RAÍZ CUADRADA DE AMBOS TÉRMINOS:
√144 = 12
√(a + b)² = a + b
(12 + a + b)(12 - a - b)
ESO ES TODO, SALUDOS....................