the first and second derivative of f(x) at the point x=1 don't exist!
i need help finding the first and second derivative of this peicewise function
f(x)= { 2(x+1)^2 , x<1
{ -x^2 +9 , x >= 1
the two { are supposed to be one big {
oh and when you want to check for concavity and increasing and decreasing, do you check each function of the peicewise seperately?
thanks in advance