Find the area of the region enclosed by the inner loop of the curve .
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9. Graphical Applications of Integrals
Area Between Curves
Multiple Choice
Find the area of the region R bounded by the graphs of , , and .
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Verified step by step guidance1
Step 1: Identify the region R bounded by the given curves. The curves are y = x^2 + 1 (a parabola), y = 2x (a straight line), and x = 0 (the y-axis). Sketch the graphs to visualize the region of interest.
Step 2: Determine the points of intersection between the curves y = x^2 + 1 and y = 2x. Set x^2 + 1 = 2x and solve for x. Rearrange the equation to x^2 - 2x + 1 = 0, which factors as (x - 1)^2 = 0, giving x = 1.
Step 3: Note that the region is bounded by x = 0 and x = 1. To find the area, set up the integral of the difference between the upper curve (y = 2x) and the lower curve (y = x^2 + 1) over the interval [0, 1]. The area is given by: ∫[0 to 1] [(2x) - (x^2 + 1)] dx.
Step 4: Simplify the integrand: (2x) - (x^2 + 1) = -x^2 + 2x - 1. The integral becomes ∫[0 to 1] (-x^2 + 2x - 1) dx.
Step 5: Compute the integral term by term: ∫[0 to 1] (-x^2) dx + ∫[0 to 1] (2x) dx + ∫[0 to 1] (-1) dx. Evaluate each term using the power rule for integration and the limits of integration [0, 1]. Combine the results to find the total area.
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