Question

$x^2 - 16=0$
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Answer 1

x² - 16 = 0
x² = 16
x = ±√16
x = ±4

Answer 2

${x}^{2} - 16 = 0 \\ {x}^{2} = 0 + 16 \\ {x}^{2} = 16 \\ x = \pm \sqrt{16} \\ x = \pm \: 4$

$S = \{ - 4 , + 4 \}$