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f(0)= -7 nili minimum -7 ,f(4)=64+96 - 7 =153 nilai maksimum = 153
b. f(x) = x³ + 3x² - 9x + 6 <=>f'(x)= 3x² - 6x + 9=0 <=> f'(x)= x² - 2x + 3
f'(x)=(x+1)(x - 3)= 0 <=> X1= -1 , X2 = 3 ==>- - - - - I++++++I- - - - - -
-1 3
Minimum f(-1)=17 ,Makimum f(3)= 33