exam Maths Puzzle Numerical Ability

Given f(x) = x^2 -f if x <-1
3x+2 if x >- -1 , find f(-1)

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exam Other Question

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. ok i need help with this problem:
1x+2y=2
-4x+3y=25
using the elimination process