Hi not sure if I've got this right.
Determine any points at which the gradient of is zero, and detemine whether these are maxima, minima or points of inflection.
x = 2
(left of turning point) x = 1
(right of turning point) x = 3
I'm not sure if I've done this right, but if I were to answer this I believe (2, -5) is minima.