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What is the value of 
log_(8)root(5)(512) ?
Answer:

Evaluate.\newlinelog85125 \log _{8} \sqrt[5]{512} \newlineWrite your answer in simplest form.

Full solution

Q. Evaluate.\newlinelog85125 \log _{8} \sqrt[5]{512} \newlineWrite your answer in simplest form.
  1. Identify Value of Fifth Root: Identify the value of the fifth root of 512512. The fifth root of a number is the value that, when raised to the power of 55, gives the original number. We know that 512512 is 22 raised to the power of 99 (292^9), so we need to find a number that when raised to the power of 55 gives 292^9.
  2. Calculate Fifth Root: Calculate the fifth root of 512512. Since 512512 is 292^9, we can write the fifth root of 512512 as (29)1/5(2^9)^{1/5}. Using the property of exponents that (am)1/n=am/n(a^m)^{1/n} = a^{m/n}, we get (29)1/5=29/5=21+4/5=2×24/5.(2^9)^{1/5} = 2^{9/5} = 2^{1+4/5} = 2 \times 2^{4/5}.
  3. Simplify Expression: Simplify the expression 2×24/52 \times 2^{4/5}.\newlineSince 22 is just 212^1, we can combine the exponents by adding them when multiplying the same base. Therefore, 2×24/5=21+4/5=29/5.2 \times 2^{4/5} = 2^{1+4/5} = 2^{9/5}.
  4. Rewrite with Simplified Expression: Rewrite the logarithm with the simplified expression.\newlineNow we have log8295\log_{8} 2^{\frac{9}{5}}. We can use the change of base formula for logarithms, which states that logab=logcblogca\log_{a} b = \frac{\log_{c} b}{\log_{c} a}. We will use base 22 for this transformation.
  5. Apply Change of Base: Apply the change of base formula.\newlineUsing the change of base formula, we get log8295=log2295log28.\log_{8} 2^{\frac{9}{5}} = \frac{\log_{2} 2^{\frac{9}{5}}}{\log_{2} 8}.
  6. Simplify Logarithms: Simplify the logarithms.\newlineSince the base and the argument of the first logarithm are the same (base 22), log2295\log_{2} 2^{\frac{9}{5}} simplifies to 95\frac{9}{5}. For the second logarithm, 88 is 232^3, so log28\log_{2} 8 simplifies to 33.
  7. Complete Division: Complete the division.\newlineNow we have (95)/3(\frac{9}{5}) / 3. To divide a fraction by a whole number, we multiply the fraction by the reciprocal of the whole number. So, (95)/3=(95)×(13)=915=35(\frac{9}{5}) / 3 = (\frac{9}{5}) \times (\frac{1}{3}) = \frac{9}{15} = \frac{3}{5}.
  8. Write Final Answer: Write the final answer.\newlineThe value of log85125\log_{8} \sqrt[5]{512} is 35\frac{3}{5}.

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