Question

$x^{2} +9 =45$

Answer 1

x=6

Explicación paso a paso:

${x}^{2} + 9 = 45 \\ {x}^{2} = 45 - 9 \\ {x}^{2} = 36$

$x = \sqrt{36}$

$x = 6$

comprobacion:

${x}^{2} (6) + 9 = 45 \\ {6}^{2} + 9 = 45 \\ 36 + 9 = 45 \\ 45 = 45$