exam Maths Puzzle Numerical Ability

How can i simplify the following:

square root of 50x^3y^5

and

square root of 9c^2/ square root of 6d?

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exam Other Question

I do not understand the process I am told k=2 but how did that come to be?
when I try to use other sites, the computer tells me variables can not be used as an exponent Thank you -Comicruler

solve for k

x^k-12=(x^2)^-k-3
1/5b= -8 what does b equal