Solve: 3log₄(9) + 8log₄(1/3) Logarithmic Expression

3log49+8log413= 3\log_49+8\log_4\frac{1}{3}=

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Step-by-step video solution

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00:00 Solve
00:06 We will use the formula for log of power
00:20 We will use this formula in our exercise
00:36 Let's solve each power separately
00:52 We will use the formula for adding logarithms
01:03 We will use this formula in our exercise
01:21 Let's calculate the fraction
01:32 Convert from fraction to negative power
01:35 And again we'll use the formula for log of power
01:40 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

3log49+8log413= 3\log_49+8\log_4\frac{1}{3}=

2

Step-by-step solution

Where:

3log49=log493=log4729 3\log_49=\log_49^3=\log_4729

y

8log413=log4(13)8= 8\log_4\frac{1}{3}=\log_4\left(\frac{1}{3}\right)^8=

log4138=log416561 \log_4\frac{1}{3^8}=\log_4\frac{1}{6561}

Therefore

3log49+8log413= 3\log_49+8\log_4\frac{1}{3}=

log4729+log416561 \log_4729+\log_4\frac{1}{6561}

logax+logay=logaxy \log_ax+\log_ay=\log_axy

(72916561)=log419 \left(729\cdot\frac{1}{6561}\right)=\log_4\frac{1}{9}

log491=log49 \log_49^{-1}=-\log_49

3

Final Answer

log49 -\log_49

Practice Quiz

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\( \log_{10}3+\log_{10}4= \)

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