T408

f(x) = (-x^(2)) + (3 * x) + 4
teksti1 = LaTeX(f, true, true)
a = RectangleSum(f, -1, 4, 4, 0.5)
eq1: x = -1 + 5 / 8
eq2: x = -1 + 5 / 4 + 5 / 8
A = Intersect(eq1, xAxis)
B = Intersect(eq2, xAxis)