Let f(x)=x−4 and g(x)=(x−4)3. Find the sum of the areas enclosed by the graphs of f and g between x=3 and x=5.Use a graphing calculator and round your answer to three decimal places.
Q. Let f(x)=x−4 and g(x)=(x−4)3. Find the sum of the areas enclosed by the graphs of f and g between x=3 and x=5.Use a graphing calculator and round your answer to three decimal places.
Understand the Problem: First, we need to understand the problem. We are asked to find the sum of the areas between two curves, f(x) and g(x), from x=3 to x=5. To do this, we will calculate the definite integral of the absolute value of the difference between the two functions over the interval [3,5].
Set Up Integral: Let's set up the integral to find the area between the two curves. The area A can be found by integrating the absolute value of the difference between f(x) and g(x) from x=3 to x=5:A=∫35∣f(x)−g(x)∣dx
Determine Top Function: We need to determine the function that is on top (greater y-value) over the interval [3,5]. Since f(x) is a linear function and g(x) is a cubic function with the same root at x=4, we can expect g(x) to be below f(x) near the root. However, we should verify this by evaluating the functions at a point in the interval, such as x=3.5.f(3.5)=3.5−4=−0.5g(3.5)=(3.5−4)3=−0.53=−0.125Since [3,5]0, f(x) is above g(x) in the interval [3,5].
Write Integral: Now we can write the integral without the absolute value, as we know f(x) is above g(x):A=∫35(f(x)−g(x))dxA=∫35((x−4)−(x−4)3)dx
Calculate Integral: Let's calculate the integral:A=∫35(x−4−(x−4)3)dxA=[21x2−4x−41x4+4x3−16x2+64x−64]35Now we need to evaluate this antiderivative at the bounds x=5 and x=3 and subtract the results.
Evaluate at x=5: Evaluating the antiderivative at x=5:
However, this calculation is incorrect because the antiderivative was not computed correctly. There is a math error in the antiderivative expression and its evaluation.
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