A_1

A_2

A_3

f(x) = -\frac{1}{10}x^4 + \frac{9}{20}x^3-\frac{3}{20}x^2-\frac{7}{10}x

f(x) = (((((-(1 / 10)) * (x + 1)) * x) * (x - 2)) * (x - 3.5))
a = Integral(f, -1, 0)
b = Integral(f, 0, 2)
c = Integral(f, 2, 3.5)