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nilai maksimum dicapai jika f' x=0 dan f" x<0
12x - 3x^2=0 ..... 3x(4-x)=0....... x=0 atau x= 4
daerah -1<x<3 berarti x=0, maka minimum x=0 ... fx=0
untuk x=4 ....fx = 6 . 4^2 - 4^3 = 32 maksimum