exam Maths Puzzle Numerical Ability

divide x^2-3x-54 by x+6

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exam Other Question

It says to simplify:
a/8-3/2a^2 (/ is a radical sign)
I have come to the conclusion that this can not be simplified! Am I right?
Thanks for your input!
ac
Simplify. Write your answer with only positive exponents. Please show work.

y^5/y^10