exam Maths Puzzle Numerical Ability

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exam Other Question

It says to simplify:
9/(radical sign)2-/8
Is this correct?
I got:
9/2-/4*2=9/2-2/2
7/2
I appreciate your imput!
Thank you
CH
3 nth roots of 4 diveded by
5 nth roots of 8

could you tell me how to solve this problem step by step please and thankyou