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Find the average value of the function 
f(x)=(1)/(x-1) from 
x=5 to 
x=9. Express your answer as a constant times 
ln 2.
Answer: 
◻ln 2

Find the average value of the function f(x)=1x1 f(x)=\frac{1}{x-1} from x=5 x=5 to x=9 x=9 . Express your answer as a constant times ln2 \ln 2 .\newlineAnswer: ln2 \square\ln 2

Full solution

Q. Find the average value of the function f(x)=1x1 f(x)=\frac{1}{x-1} from x=5 x=5 to x=9 x=9 . Express your answer as a constant times ln2 \ln 2 .\newlineAnswer: ln2 \square\ln 2
  1. Average Value Formula: To find the average value of a continuous function f(x)f(x) on the interval [a,b][a, b], we use the formula for the average value of a function on an interval, which is given by:\newlineAverage value = 1(ba)abf(x)dx\frac{1}{(b-a)} \int_{a}^{b} f(x) \, dx\newlineHere, f(x)=1(x1)f(x) = \frac{1}{(x-1)}, a=5a = 5, and b=9b = 9.
  2. Calculate Integral: First, we calculate the integral of f(x)=1x1f(x) = \frac{1}{x-1} from x=5x=5 to x=9x=9.59(1x1)dx\int_{5}^{9} \left(\frac{1}{x-1}\right) dxThis is a standard integral that can be solved by recognizing it as the integral of 1u\frac{1}{u} where u=x1u = x - 1.Let u=x1u = x - 1, then du=dxdu = dx.
  3. Apply u-Substitution: Change the limits of integration to match the u-substitution.\newlineWhen x=5x = 5, u=51=4u = 5 - 1 = 4.\newlineWhen x=9x = 9, u=91=8u = 9 - 1 = 8.\newlineNow we integrate with respect to uu from u=4u=4 to u=8u=8.\newline48(1u)du\int_{4}^{8} (\frac{1}{u}) \, du
  4. Evaluate Integral: The integral of 1u\frac{1}{u} with respect to uu is lnu\ln|u|. So we evaluate lnu\ln|u| from u=4u=4 to u=8u=8. lnu\ln|u| evaluated from 44 to 88 is ln8ln4\ln|8| - \ln|4|.
  5. Simplify Natural Log: We know that ln8\ln|8| is ln(23)\ln(2^3) which is 3ln(2)3\ln(2), and ln4\ln|4| is ln(22)\ln(2^2) which is 2ln(2)2\ln(2). So, ln8ln4=3ln(2)2ln(2)=ln(2)\ln|8| - \ln|4| = 3\ln(2) - 2\ln(2) = \ln(2).
  6. Multiply by Factor: Now we have the integral result, which is ln(2)\ln(2). We need to multiply this by the factor (1/(ba))(1/(b-a)) to find the average value.\newline(1/(95))×ln(2)=(1/4)×ln(2)(1/(9-5)) \times \ln(2) = (1/4) \times \ln(2).
  7. Final Answer: Simplify the expression to get the final answer.\newline(14)×ln(2)=0.25ln(2)(\frac{1}{4}) \times \ln(2) = 0.25\ln(2).

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