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Math 2260 Exam #1 Practice Problem Solutions

Math 2260 Exam #1 Practice Problem Solutions 1. What is the area bounded by the curves y = x2 1 and y = 2x + 7? Answer: As we can see in the figure, the line y = 2x + 7 lies above the parabola y = x2 1 in the region we care about. Also, the points of intersection occur when 2x + 7 = x2 1 or, equivalently, when 0 = x2 2x 8 = (x 4)(x + 2), so the curves intersect when x = 4 and x = 2. Therefore, integrating top minus bottom over this region should yield the area between the curves: Z 4 Z 4. (2x + 7) x2 1 dx = 2x + 8 x2 dx . 2 2. 4. x3.

Math 2260 Exam #1 Practice Problem Solutions 1.What is the area bounded by the curves y= x2 1 and y= 2x+ 7? Answer: As we can see in the gure, the line y= 2x+ 7 lies above the parabola y= x2 1 in the region we care about. Also, the points of intersection occur when 2x+ 7 = x2 1 or, equivalently, when 0 = x2 2x 8 = (x 4)(x+ 2);

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