exam Maths Puzzle Numerical Ability

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

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exam Other Question

Solve each of the following inequality. Express your final answer using inequality.

-22<2z-4<0
determine the 8th term of the following geometric sequence?
3,9,27
write your answer as a single integer value, not an expression.