exam Maths Puzzle Numerical Ability

I have no idea how to find the domain of problems 3-6. Also, i can't figure out how to factor 18-20.

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exam Other Question

given f(x)=-3x+4 and g(x)=x^2-5 find the following:
f(2) + g(2)

f(2)- g(2)

g(2)/f(2)

f(3)*g(3)
Find each partial fraction decomposition
3x^2+3x-2 divided by
x^3-3x^2-9x+27