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x² = 16x - 63
x² - 16x + 63 = 0 Factorizas trinomio de la forma x² + bx + x
(x - 9)(x - 7) = 0 Tiene como solución 2 raices reales
x - 9 = 0
x = 9
o
x - 7 = 0
x = 7
Solucion.
( 9 , 7)