Explicación paso a paso:
X² - 81 = 0
X² = 81
X = ± √81
X = ±9
X = 9
X = -9
Espero que te ayude!!!!!!!
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Explicación paso a paso:
X² - 81 = 0
X² = 81
X = ± √81
X = ±9
X = 9
X = -9
Espero que te ayude!!!!!!!