Please help! I've looked everywhere!

Answer:
[tex]\frac{a^{2} }{4}[/tex]
Step-by-step explanation:
2[tex]\sqrt{2x}[/tex] = a
Divide both sides by 2.
[tex]\sqrt{2x}[/tex] = [tex]\frac{a}{2}[/tex]
Square both sides.
2x = ([tex]\frac{a}{2}[/tex])²
= [tex]\frac{a}{2}[/tex] × [tex]\frac{a}{2}[/tex]
2x = [tex]\frac{a^{2}}{4}[/tex]