Answer
$x=17$
Work Step by Step
$\sqrt {5x-4}=9$
$(\sqrt {5x-4})^2=9^2$
$5x-4=81$
$5x-4+4=81+4$
$5x=85$
$5x/5=85/5$
$x=17$
$\sqrt {5x-4}=9$
$\sqrt {5*17-4}=9$
$\sqrt {85-4}=9$
$\sqrt {81}=9$
$9=9$ (true)
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