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f(x)=x³+6x²-15x
f'(x)=3x²+12x-15
f'(x)<0
3x²+12x-15<0
x²+4x-5<0
(x+5)(x-1)<0
x=-5
x=1
-5<x<1
jadi f(x) turun -5<x<1