book Maths Puzzle Numerical Ability

a radical sign with 12x + 12(under it) + a radical sign with 3x + 3 ( under it)

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book Other Question

I DONT GET THE INVERSE WITH EXPONENTS WITH THEM LIKE FOR EXAMPLE:
f(x)=2x^3 or f(x)=x^2-2x
Can you explain to me the Absolute Value-Square Root Theorem?
Thank you.