If m ≤ f(x) ≤ M for a ≤ x ≤ b, where m is the absolute minimum and M is the absolute maximum of f on the interval [a, b], then m(b − a) ≤
b
f(x) dx

a
≤ M(b − a).
Use this property to estimate the value of the integral.
2
0
3/1 + x2 dx