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 am stuck on these two problems and need some help

Simplify: square root of 7(5 square root5-3 square root 7)

and also
simplify: Square root 75a^2 over square root5

Thanks a million if -6(2x+1)=-4x+10, then x =