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Find the value of 
int_(4)^(9)(1)/(3x-11)dx. Express your answer as a constant times 
ln 2.
Answer: 
◻ln 2

Find the value of 4913x11dx \int_{4}^{9} \frac{1}{3 x-11} d x . Express your answer as a constant times ln2 \ln 2 .\newlineAnswer: ln2 \square \ln 2

Full solution

Q. Find the value of 4913x11dx \int_{4}^{9} \frac{1}{3 x-11} d 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. The integral 13x11dx\int \frac{1}{3x-11}\,dx is a standard form of the integral of a function 1ax+b\frac{1}{ax+b}. The antiderivative of 1ax+b\frac{1}{ax+b} is 1alnax+b+C\frac{1}{a}\ln|ax+b| + C, where CC is the constant of integration.
  2. Calculate antiderivative: Calculate the antiderivative.\newlineTo find the antiderivative of (1)/(3x11)(1)/(3x-11), we can use the formula mentioned above with a=3a = 3 and b=11b = -11. Thus, the antiderivative is (1/3)ln3x11+C(1/3)\ln|3x-11| + C.
  3. Evaluate definite integral: Evaluate the definite integral from 44 to 99. We need to evaluate the antiderivative at the upper and lower limits of the integral and subtract the lower evaluation from the upper evaluation. 4913x11dx=[13ln3x11]\int_{4}^{9}\frac{1}{3x-11}dx = \left[\frac{1}{3}\ln|3x-11|\right] from x=4x=4 to x=9x=9 = 13ln3(9)1113ln3(4)11\frac{1}{3}\ln|3(9)-11| - \frac{1}{3}\ln|3(4)-11| = 13ln271113ln1211\frac{1}{3}\ln|27-11| - \frac{1}{3}\ln|12-11| = 13ln1613ln1\frac{1}{3}\ln|16| - \frac{1}{3}\ln|1|
  4. Simplify expression: Simplify the expression.\newlineSince ln1=0\ln|1| = 0, we can simplify the expression to:\newline(1/3)ln16(1/3)(0)(1/3)\ln|16| - (1/3)(0)\newline=(1/3)ln(16)= (1/3)\ln(16)\newline=(1/3)ln(24)= (1/3)\ln(2^4)\newline=(1/3)(4)ln(2)= (1/3)(4)\ln(2)\newline=(4/3)ln(2)= (4/3)\ln(2)
  5. Express final answer: Express the answer as a constant times ln2\ln 2. The final answer is (43)ln(2)(\frac{4}{3})\ln(2), which is already expressed as a constant times ln2\ln 2.