local min =

x =

The question says if the function has a local min of at x = what are the values of a and b?

b). which of the tangent lines to the curve in part a has the smallest slope?

Please lead me in the right way i dont care about the answers just tell me how i would find the values a or b

i tried plugging in the value of x into f(X) Then i found the derivative and i got stuck

thanks!!