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SI: a + b = 9 ; ab = 37, hallar a² + b²
HACEMOS LO SIGUIENTE:
(a + b)² = (9)²
DESARROLLAMOS EL BINOMIO:
a² + b² + 2ab = 81
a² + b² + 2(37) = 81
a² + b² = 7
ESO ES TODO, SALUDOS