Graph the function f(a) = x2 - 4x + 2 over the interval [1, 4). (a) Partition the interval into 4 subintervals of equal length. Then add to your sketch the rectangles associated with the Riemann sum using the midpoint of each interval as sample point. (b) Use the form of the definition of the integral given in Theorem 4 of Section 5.2 to evaluate the integral (x2 - 4x + 2)dx