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Find the value of 
int_(7)^(9)(2dx)/(x-11). Write your answer as the logarithm of a single number in simplest form.
Answer: 
ln(◻)

Find the value of 792dxx11 \int_{7}^{9} \frac{2 d x}{x-11} . Write your answer as the logarithm of a single number in simplest form.\newlineAnswer: ln() \ln (\square)

Full solution

Q. Find the value of 792dxx11 \int_{7}^{9} \frac{2 d x}{x-11} . Write your answer as the logarithm of a single number in simplest form.\newlineAnswer: ln() \ln (\square)
  1. Apply Fundamental Theorem: We apply the fundamental theorem of calculus to evaluate the definite integral: \newline792dxx11=[2lnx11]\int_{7}^{9}\frac{2dx}{x-11} = [2\ln|x-11|] from 77 to 99.\newlineWe substitute the upper and lower limits into the antiderivative:\newline2ln9112ln7112\ln|9-11| - 2\ln|7-11|.
  2. Simplify with Substitution: Now we simplify the expression by substituting the values: \newline2ln22ln42\ln|-2| - 2\ln|-4|.\newlineSince the logarithm of a negative number is not defined in the real number system, we can remove the absolute value bars because both 2-2 and 4-4 are negative and will become positive inside the absolute value.\newlineThis gives us:\newline2ln(2)2ln(4)2\ln(2) - 2\ln(4).
  3. Further Logarithm Simplification: We can further simplify the expression using logarithm properties: \newline2ln(2)2ln(4)=2ln(2)2ln(22)2\ln(2) - 2\ln(4) = 2\ln(2) - 2\ln(2^2).\newlineSince ln(22)=2ln(2)\ln(2^2) = 2\ln(2), the expression becomes:\newline2ln(2)2(2ln(2))2\ln(2) - 2(2\ln(2)).
  4. Distribute and Simplify: Now we simplify the expression by distributing the 22 in the second term: 2ln(2)4ln(2)2\ln(2) - 4\ln(2). This simplifies to: 2ln(2)-2\ln(2).
  5. Final Answer: The final answer is the negative of two times the natural logarithm of 22:
    Answer: ln(22)\ln(2^{-2}).
    We can use the property of logarithms that ln(ab)=bln(a)\ln(a^b) = b\cdot\ln(a) to write the answer as a single logarithm:
    ln(22)=ln(14)\ln(2^{-2}) = \ln(\frac{1}{4}).