book Maths Puzzle Numerical Ability

I am having problems extracting the roots from the problem 2x^2 /3 = 4
Two x squared over three = four

I know that eventually the four will root down to two

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book Other Question

log(x)^2=2logx This one is also true right? Thank you for you help. Does this parabola open up, down, left or right?

{{{x=-2y^2}}}