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Solve 
(log_(81)x)((1)/(log_(x)3))=6(1)/(4)

Solve (log81x)(1logx3)=614 \left(\log _{81} x\right)\left(\frac{1}{\log _{x} 3}\right)=6 \frac{1}{4}

Full solution

Q. Solve (log81x)(1logx3)=614 \left(\log _{81} x\right)\left(\frac{1}{\log _{x} 3}\right)=6 \frac{1}{4}
  1. Understand given equation: Let's start by understanding the given equation: (log81x)(1logx3)=64(\log_{81}x)\left(\frac{1}{\log_{x}3}\right)=\frac{6}{4}. We can use the property of logarithms that states logab=1logba\log_{a}b = \frac{1}{\log_{b}a}, which is known as the change of base formula. This allows us to rewrite the equation in a more familiar form.
  2. Apply change of base formula: Applying the change of base formula to the given equation, we get:\newline(log81x)(log3x)=614(\log_{81}x)(\log_{3}x) = 6\frac{1}{4}\newlineSince 8181 is 33 raised to the power of 44 (81=3481 = 3^4), we can rewrite log81x\log_{81}x as 14log3x\frac{1}{4}\log_{3}x.
  3. Substitute and simplify: Substituting log81x\log_{81}x with (14)log3x(\frac{1}{4})\log_{3}x in the equation, we have:\newline((14)log3x)(log3x)=6(14)((\frac{1}{4})\log_{3}x)(\log_{3}x) = 6(\frac{1}{4})\newlineNow, let's simplify the left side of the equation by multiplying the two logarithms together.
  4. Multiply logarithms: Multiplying the two logarithms together, we get:\newline(14)(log3x)2=6(14)(\frac{1}{4})(\log_{3}x)^2 = 6(\frac{1}{4})\newlineNow, we can multiply both sides of the equation by 44 to get rid of the fraction on the left side.
  5. Multiply by 44: Multiplying both sides by 44, we obtain: (log3x)2=6(\log_{3}x)^2 = 6 Now, we can take the square root of both sides to solve for log3x\log_{3}x.
  6. Take square root: Taking the square root of both sides, we have:\newlinelog3x=6\log_{3}x = \sqrt{6} or log3x=6\log_{3}x = -\sqrt{6}\newlineHowever, since a logarithm cannot have a negative result if the base and the argument are positive and real (which they are in this case), we discard the negative solution.
  7. Discard negative solution: We are left with log3x=6\log_{3}x = \sqrt{6}. To find the value of xx, we need to rewrite this equation in exponential form, which is x=36x = 3^{\sqrt{6}}.

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