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Find the value of 
int_(2)^(7)(5dx)/(x-12). Express your answer as a constant times 
ln 2.
Answer: 
◻ln 2

Find the value of 275dxx12 \int_{2}^{7} \frac{5 d x}{x-12} . Express your answer as a constant times ln2 \ln 2 .\newlineAnswer: ln2 \square \ln 2

Full solution

Q. Find the value of 275dxx12 \int_{2}^{7} \frac{5 d x}{x-12} . 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 5dxx12\int \frac{5dx}{x-12} can be recognized as a standard form of the integral 1udu\int \frac{1}{u}du, where u=x12u = x - 12.
  2. Perform substitution: Perform a substitution.\newlineLet u=x12u = x - 12, then du=dxdu = dx. The integral becomes 5duu\int \frac{5du}{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 5lnu+C5\ln|u| + C, where CC is the constant of integration.
  4. Substitute back for u: Substitute back for uu.\newlineReplace uu with x12x - 12 to get 5lnx12+C5\ln|x - 12| + C.
  5. Evaluate definite integral: Evaluate the definite integral from 22 to 77.\newlineWe need to evaluate 5lnx125\ln|x - 12| from x=2x = 2 to x=7x = 7. This gives us 5ln7125ln2125\ln|7 - 12| - 5\ln|2 - 12|.
  6. Simplify expression: Simplify the expression.\newlineSince 712=57 - 12 = -5 and 212=102 - 12 = -10, and the absolute value of a negative number is positive, we have 5ln(5)5ln(10)5\ln(5) - 5\ln(10).
  7. Use logarithm properties: Use the properties of logarithms.\newlineWe can use the property ln(a)ln(b)=ln(ab)\ln(a) - \ln(b) = \ln(\frac{a}{b}) to combine the logarithms: 5ln(510)5\ln(\frac{5}{10}).
  8. Simplify fraction in logarithm: Simplify the fraction inside the logarithm.\newlineThe fraction 510\frac{5}{10} simplifies to 12\frac{1}{2}, so the expression becomes 5ln(12)5\ln(\frac{1}{2}).
  9. Bring constant outside logarithm: Use the property of logarithms to bring the constant outside the logarithm.\newlineSince ln(ab)=bln(a)\ln(a^b) = b\ln(a), we can write 5ln(12)5\ln(\frac{1}{2}) as 5ln(2)-5\ln(2) because ln(12)=ln(21)=ln(2)\ln(\frac{1}{2}) = \ln(2^{-1}) = -\ln(2).
  10. Express final answer: Express the final answer.\newlineThe value of the definite integral from 22 to 77 of 5dxx12\frac{5dx}{x-12} is 5ln(2)-5\ln(2).