book Maths Puzzle Numerical Ability

log(x)^2=2logx This one is also true right? Thank you for you help.

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book Other Question

Evaluate. 4 · 2^2 - 2 · 8 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