F(x)=-x^3/3-x^2/2+12x
F(3)=-27/3 - 9/2 + 12*3=-9-4.5+36=22.5
F(-5)=125/3-25/2+12*(-5)=250/6 - 75/6 - 360/6=-185/6
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F(x)=-x^3/3-x^2/2+12x
F(3)=-27/3 - 9/2 + 12*3=-9-4.5+36=22.5
F(-5)=125/3-25/2+12*(-5)=250/6 - 75/6 - 360/6=-185/6