exam Maths Puzzle Numerical Ability

Find g[f(4)]if:
f(x)=6x, and g(x)=-2x-2

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Tutors please help me????

Use the rational zeros theorem to list all possible rational zeros of
P(x)=3x^3-5x^2+4x-2 This problem has been bothering me for a while now. I need help on how to solve it. It goes like this: If f(x)= 1-3x and g(x)= 1/ x^2 +1, find f(g(0)) and g(f(1))