What is the local maximum and minimum values and saddle point(s) of the function?

f(x, y) =x³y+12x²- 8y

maximum

f(,) =(smallerxvalue)

f(,) =(largerxvalue)

minimum

f(,) =(smallerxvalue)

f(,) =(largerxvalue)

saddle points

(,) (smallestxvalue)

(,) (largestxvalue)