exam Maths Puzzle Numerical Ability

Find each partial fraction decomposition
3x^2+3x-2 divided by
x^3-3x^2-9x+27

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exam Other Question

I have no idea how to find the domain of problems 3-6. Also, i can't figure out how to factor 18-20. how can i factorize 4^3x^2 +5x -2^3 please i need help in this sum