Find the value of X. Write your answer in simplest form.
X=__

Answer:
3
Step-by-step explanation:
[tex]x {}^{2} + x {}^{2} = (3 \sqrt{2} ) {}^{2} = 18[/tex]
[tex]2x {}^{2} = 18[/tex]
[tex]x = 3[/tex]