Question

$\sqrt{ \times + 9 = 7}$
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Answer 1

$\sqrt{x + 9} = 7$

$\sqrt{x + 9} {}^{2} = 7 {}^{2}$

$x + 9 = 49$

$x = 49 - 9$

$\boxed{x = 40}$

Att. YRZ