exam Maths Puzzle Numerical Ability

I am having a problem solving this problem:

Is the square root of x^2 =x an identity (true for all values of x)?
Thanks for your time.

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exam Other Question

please help me answer this problem
n+9
_____
n^2

times

6n^2
_____
n^2-8
Can someone help me with this problem?

I need to divide:


m^8n^6/m^4n^2

Thank you,
Ashley