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X: El número buscado.
RESOLVIENDO:
2X² - 18 = 0
2X² = 18 ===> Simplificamos
X² = 9
X = √9
X = 3 ===> El número buscado. RESPUESTA.
COMPROBACIÓN:
2(3)² - 18 = 0
6² - 18 = 0
3² - 9 = 0
9 - 9 = 0
0 = 0
MUCHA SUERTE...!!!