Question

determine o valor de x na igualdade √x-5 = 3 sobre √x-5

Answer 1

$\sqrt{x-5} = \frac{3}{\sqrt{x-5}}$

$(\sqrt{x-5}).(\sqrt{x-5}) = 3$

$(\sqrt{x-5})^2 = 3$

$x - 5 = 3$

$x = 3 + 5$

$x = 8$