Answer:
x=3√2 or x=−3√2
Step-by-step explanation:
Step 1: Take square root.
x=±√18
[tex]x=3\sqrt{2}[/tex]
[tex]x^{2} =18\\x^{2} = (\sqrt{18} )^2\\x = \sqrt{18} \\x=3\sqrt{2}[/tex]