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Find the value of 
int_(4)^(6)(3dx)/(x-8). Express your answer as a constant times 
ln 2.
Answer: 
◻ln 2

Find the value of 463dxx8 \int_{4}^{6} \frac{3 d x}{x-8} . Express your answer as a constant times ln2 \ln 2 .\newlineAnswer: ln2 \square \ln 2

Full solution

Q. Find the value of 463dxx8 \int_{4}^{6} \frac{3 d x}{x-8} . Express your answer as a constant times ln2 \ln 2 .\newlineAnswer: ln2 \square \ln 2
  1. Recognize standard form: Recognize the integral as a standard form.\newlineThe integral 3dxx8\int \frac{3dx}{x-8} can be recognized as a standard form of the integral 1udu\int \frac{1}{u}du, where u=x8u = x - 8.
  2. Perform substitution: Perform a substitution.\newlineLet u=x8u = x - 8, then du=dxdu = dx. The integral becomes 3duu\int \frac{3du}{u}.
  3. Integrate using logarithm: Integrate using the natural logarithm.\newlineThe integral of 1u\frac{1}{u} with respect to uu is lnu\ln|u|. Therefore, the integral becomes 3lnu+C3\ln|u| + C, where CC is the constant of integration.
  4. Substitute back for x: Substitute back for xx.\newlineSince u=x8u = x - 8, the integral becomes 3lnx8+C3\ln|x - 8| + C.
  5. Evaluate definite integral: Evaluate the definite integral from 44 to 66.\newlineWe need to evaluate 3lnx83\ln|x - 8| from x=4x = 4 to x=6x = 6. This gives us 3ln683ln483\ln|6 - 8| - 3\ln|4 - 8|.
  6. Simplify expression: Simplify the expression.\newlineSimplify the expression to get 3ln23ln43\ln|-2| - 3\ln|-4|. Since the natural logarithm of a positive number is the same as the natural logarithm of its absolute value, this simplifies to 3ln(2)3ln(4)3\ln(2) - 3\ln(4).
  7. Combine logarithm terms: Use logarithm properties to combine terms.\newlineUsing the property of logarithms that ln(a)ln(b)=ln(ab)\ln(a) - \ln(b) = \ln(\frac{a}{b}), we get 3ln(24)3\ln\left(\frac{2}{4}\right).
  8. Simplify fraction inside logarithm: Simplify the fraction inside the logarithm.\newlineThe fraction 24\frac{2}{4} simplifies to 12\frac{1}{2}, so the expression becomes 3ln(12)3\ln\left(\frac{1}{2}\right).
  9. Use logarithm property: Use the property of logarithms ln(a1)=ln(a)\ln(a^{-1}) = -\ln(a).\newlineThe expression 3ln(12)3\ln\left(\frac{1}{2}\right) is equivalent to 3(ln(2))3(-\ln(2)), which simplifies to 3ln(2)-3\ln(2).
  10. Express as constant times ln(22): Express the answer as a constant times ln(2)\ln(2).\newlineThe final answer is 3ln(2)-3\ln(2), which is the value of the definite integral from 44 to 66 of 3dxx8\frac{3dx}{x-8}.