exam Maths Puzzle Numerical Ability

Hi Can I have some help finding the domain of the function?

f(x)=1/3x-6

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exam Other Question

3 over a^-9 + 3 over a+3

over

4 over a^2-9 + 1 over a+3

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Hello, can anyone tell me if this is a prime polynomial or not? And if so can you show me how to factor it completely.

Thank you in advance I love your site.

18y 4th power - 42y cubed