Let be the function defined on the closed interval by g(x)= cases x^ 2 -4, & -2 x<1,…

MATHEMATICS · Multi-part · AP · Calculus AB · Integration and Accumulation of Change · Integration and Accumulation of Change

Problem

Let gg be the function defined on the closed interval [−2,5][-2,5] by g(x)={x2−4,−2≤x<1,3,1≤x<3,undefined,x=3,10−x,3<x≤5.g(x)=\begin{cases} x^{2}-4, & -2\le x<1,\\ 3, & 1\le x<3,\\ \text{undefined}, & x=3,\\ \sqrt{10-x}, & 3< x\le 5. \end{cases} A student wishes to evaluate ∫−25g(x) dx\displaystyle\int_{-2}^{5} g(x)\,dx. (1) Identify every point in [−2,5][-2,5] at which gg is not continuous, and classify each type of discontinuity. (2) Determine whether ∫−25g(x) dx\displaystyle\int_{-2}^{5} g(x)\,dx exists. Provide a justification based on the properties of definite integrals for bounded functions with finitely many discontinuities. (3) Evaluate ∫−25g(x) dx\displaystyle\int_{-2}^{5} g(x)\,dx. Show all steps, indicating any sub-intervals over which you compute separate integrals. (4) State the numerical value of the net signed area represented by ∫−25g(x) dx\displaystyle\int_{-2}^{5} g(x)\,dx and explain, in words, the meaning of any negative contribution you obtained in part (c).

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