book Maths Puzzle Numerical Ability

4y^2 - X^2= 0

X^2 + 2y^2= 2x + 9

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book Other Question

My daughter says that her teacher did not explain how to convert unit multipliers.? I am not sure what she is asking. Can you help us please.
Thank you.
I am trying to remember how to do radical algebraic expressions and if you could just give me a sample that would be great an example problem is

150 over (square root sign) 300 and you have to simplify it.

PLEASE HELP