y=1/3x^3-2
F(x)=x^4/12-2x
F(3)=81/12-6=27/4-6=3/4
F(-2)=16/12+4=4/3+4
S=3/4+4/3+4=6 1/12
32- a + 5 = -4
-a = -4-5-32
-a = -41
a = 41