exam Maths Puzzle Numerical Ability

Will someone please help me solve this problem? It says to express in simpliest radical form:2/3radical 9

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exam Other Question

When f(x) = 2x^-1, g(x)= 2x + 5 and h(x) = (x-4)/2....... can you help me solve g(g(x)) and f(h(x))... i dont get this at all. Could you explain it to me? HOW WOULD I USE SYNTHETIC DIVISION GIVEN THE POLYNOMIAL:
P(X)=X^4-4X^3-6X^2-4X-15 AND THE FACTOR THEOREM TO FIND WHETHER X-(1+2i) IS A FACTOR
THANKS TANYA