exam Maths Puzzle Numerical Ability

Given f(x) = -x3 - 3x2 + 3x + 7, find f(-1), f(0), and f(2)

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24u-6(8-4u)+52=

Please show the steps to slove so I can use it as an example.

Thanks,
Bruce If f(x)=x(x+3)(x-1), use interval notation to give all values of x where f(x)>0.

Thanks for your time.