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Find the value of 
int_(3)^(5)(3dx)/(7-x). Express your answer as a constant times 
ln 2.
Answer: 
◻ln 2

Find the value of 353dx7x \int_{3}^{5} \frac{3 d x}{7-x} . Express your answer as a constant times ln2 \ln 2 .\newlineAnswer: ln2 \square \ln 2

Full solution

Q. Find the value of 353dx7x \int_{3}^{5} \frac{3 d x}{7-x} . 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 of the form AdxBx\int\frac{A \, dx}{B - x} can be solved by recognizing it as a natural logarithm function. The integral dxax\int\frac{dx}{a - x} is equal to lnax+C-\ln|a - x| + C, where CC is the constant of integration.
  2. Adjust to match form: Adjust the integral to match the standard form.\newlineTo match the standard form, we need to factor out the constant from the numerator. In this case, the constant is 33, so we can write the integral as 3×(dx7x)3 \times \int(\frac{dx}{7 - x}).
  3. Apply standard form: Apply the integral.\newlineNow we can integrate using the standard form:\newlinedx7x=ln7x+C\int\frac{dx}{7 - x} = -\ln|7 - x| + C\newlineSo, 3×dx7x=3×(ln7x+C)3 \times \int\frac{dx}{7 - x} = 3 \times (-\ln|7 - x| + C)
  4. Evaluate definite integral: Evaluate the definite integral from 33 to 55. We need to evaluate the antiderivative at the upper and lower limits and subtract: 3×[ln7x]3 \times [-\ln|7 - x|] evaluated from 33 to 55 = 3×[ln75+ln73]3 \times [-\ln|7 - 5| + \ln|7 - 3|] = 3×[ln2+ln4]3 \times [-\ln|2| + \ln|4|]
  5. Simplify expression: Simplify the expression.\newlineSince ln4=ln(22)=2ln2\ln|4| = \ln(2^2) = 2\ln|2|, we can simplify the expression:\newline3×[ln2+2ln2]3 \times [-\ln|2| + 2\ln|2|]\newline=3×[ln2]= 3 \times [\ln|2|]\newline=3ln2= 3\ln|2|
  6. Express final answer: Express the answer as a constant times ln2\ln 2. The final answer is already in the form of a constant times ln2\ln 2, so we can write it as: 3ln23\ln|2|