I need to finish this question very quickly and I’m confused, any help is greatly appreciated

Answer:
Step-by-step explanation:
a. sqrt(2x) = -x
b. (sqrt(2x))^2 = (-x)^2
2x = x^2
c. divide both sides by x. x = 2, 0
d. x = 2 does not satisfy the original equation, but x = 0 does.