Question

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$\times {}^{2} - 40 = - 4$
$\times {}^{2} - 100 + 19 = 0$
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Answer 1

x² - 40 = - 4

x² = - 4 + 40

x² = 36

x = ± √36

x = ± 6

x1 = - 6

x2 = 6

x² - 100 + 19 = 0

x² = -19 +100

x² = 81

x² = ± √81

x² = ± 9

x1 = -9

x2 = 9