Question

7)quanto vale x


$x {}^{2} = 9$
$a \: \: x { }^{2} = 25$
$a \: x {}^{2} = 49$
$d \: \:x {}^{2} = 81$


me ajuda pfv

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Answer 1

Resposta:

Explicação passo a passo:

$x^{2} =9\\x=\pm\sqrt{9}\\x=\pm3$

$x^{2} =25\\x=\pm\sqrt{25}\\x=\pm5$

$x^{2} =49\\x=\pm\sqrt{49}\\x=\pm7$

$x^{2} =81\\x=\pm\sqrt{81}\\x=\pm9$