exam Maths Puzzle Numerical Ability

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

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exam Other Question

Given f(x) = -x3 - 3x2 + 3x + 7, find f(-1), f(0), and f(2) y=(3/4)x+12

2x/3+1/2=2
I need help on solving these equations