(a) Estimate the area under the graph of f(x) = 4 + 2x² from x = -1 to x = 2 using three rectangles and right endpoints. R3 = Then improve your estimate by using six rectangles. R6 = Sketch the curve and the approximating rectangles for R3. y y 12 10 8 K 6 2 X 1 y 12 10 -1 -1 12 10 8 2 y 12 10 8 6 2 1 2 -1 -1 8 2

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