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4. [1.54/1.66 Points) DETAILS PREVIOUS ANSWERS + Let f(x) = 4 + 2x2 (6) Estimate the area under the graph of the x-axls, and the lines x = -1 and x = 2 using three rectangles and a right endpoints. x Ry=/22 Improve your estimate by using six rectangles. R$ 79M Sketch the curve and the approximating rectangles for Ry 121 12 10 10 8 8

0-1 -0.5 0.5 1.5 N (b) Repeat part (a) using a left endpoints. L = 16 46 = 15 X Sketch the curve and the approximating rectangles for Lz. у 12H 10 8 6