Question

Me ajude nisso por favor
${x}^{2} - 1 = 8$
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Answer 1

$\LARGE\tt{} {x}^{2} - 1 = 8 \\ \LARGE\tt{} {x}^{2} = 8 + 1 \\ \LARGE\tt{} {x}^{2} = 9 \\ \LARGE\tt{}x = \pm \: \sqrt{9} \\ \\ \LARGE\tt{}x = \pm \: 3 \\ \\ \LARGE\tt{}x = - 3 \\ \LARGE\tt{}x = 3 \\ \\ \LARGE\tt{}s: \{ x_{1} = - 3 \} \\ \LARGE\tt{} \{ x_{2} = 3 \}$

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