exam Maths Puzzle Numerical Ability

Can you help me find F(4)and the domain for the function:

F(x)=10x + 1 / x squared - 9x

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exam Other Question

Multiply:
(8√[6] + 3√[2])(4√[6] - 5√[2])

I believe FOIL is used here. I also think the answer should have no decimals.

Thanks for helping!!! Simplify by removing a factor of 1.

4ab/a^2-b^2 - a-b/a+b