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Which of the following is equivalent to 
log_(2)(c)*log_(c)(2) ?
Choose 1 answer:
(A) 
log(c)
(B) 
log(2)
(c) 1
(D) -1

Which of the following is equivalent to log2(c)logc(2) \log _{2}(c) \cdot \log _{c}(2) ?\newlineChoose 11 answer:\newline(A) log(c) \log (c) \newline(B) log(2) \log (2) \newline(C) 11\newline(D) 1-1

Full solution

Q. Which of the following is equivalent to log2(c)logc(2) \log _{2}(c) \cdot \log _{c}(2) ?\newlineChoose 11 answer:\newline(A) log(c) \log (c) \newline(B) log(2) \log (2) \newline(C) 11\newline(D) 1-1
  1. Recognize Relationship: Recognize the relationship between the two logarithms.\newlineThe two logarithms log2(c)\log_{2}(c) and logc(2)\log_{c}(2) are inverses of each other because they have their bases and arguments swapped.
  2. Apply Change of Base: Apply the change of base formula to one of the logarithms.\newlineChange of base formula: logb(a)=logk(a)logk(b)\log_{b}(a) = \frac{\log_{k}(a)}{\log_{k}(b)}, where kk is any positive number different from 11.\newlineLet's apply this to logc(2)\log_{c}(2): logc(2)=log(2)log(c)\log_{c}(2) = \frac{\log(2)}{\log(c)}.
  3. Substitute Change of Base: Substitute the change of base expression into the original equation.\newlineNow we have log2(c)(log(2)log(c))\log_{2}(c) \cdot \left(\frac{\log(2)}{\log(c)}\right).
  4. Simplify Expression: Simplify the expression.\newlineNotice that log2(c)\log_{2}(c) is equivalent to 1log(c)\frac{1}{\log(c)} in base 22. So we have (1log(c))(log(2)log(c))\left(\frac{1}{\log(c)}\right) \cdot \left(\frac{\log(2)}{\log(c)}\right).
  5. Recognize Expression Simplifies: Recognize that the expression simplifies to 11.\newlineThe log(c)\log(c) in the denominator of the first fraction and the log(c)\log(c) in the numerator of the second fraction cancel each other out, leaving us with log(2)/log(2)\log(2) / \log(2), which equals 11.

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