exam Maths Puzzle Numerical Ability

I would like help with the following: If f(x)=x(x+3)(x-1), use interval notation to give all values of x where f(x)is less than 0. Thank you.

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exam Other Question

Could anyone show me how to solve and graph the following equation?
Find the slope and Y intercept by writing the equation in slope intercept form then graph.
3x+y=-2
Thanks for all your help!
Given f(x) = x^2 -f if x <-1
3x+2 if x >- -1 , find f(-1)