Question: (a) Estimate the area under the graph of f(x) = 1 + x2 from x = -1 to x = 2 using three rectangles and

(a) Estimate the area under the graph of f(x) = 1 + x2 from x = -1 to x = 2 using three rectangles and right end points. Then improve your estimate by using six rectangles. Sketch the curve and the approximating rectangles.
(b) Repeat part (a) using left endpoints.
(c) Repeat part (a) using midpoints.
(d) From your sketches in parts (a) - (c), which appears to be the best estimate?

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