book Maths Puzzle Numerical Ability

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

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book Other Question

y=2sin(1/4)x a) What is the sum of the roots of the equation ax2(squared)+ bx + c = 0?
b) What is the product of its roots?