Algebra Examples

$\frac{\log (t)}{\log_{8} (t)}$

Step 1

Differentiate using the Quotient Rule which states that $\frac{d}{d t} [\frac{f (t)}{g (t)}]$ is $\frac{g (t) \frac{d}{d t} [f (t)] - f (t) \frac{d}{d t} [g (t)]}{{g (t)}^{2}}$ where $f (t) = \log (t)$ and $g (t) = \log_{8} (t)$ .

$\frac{\log_{8} (t) \frac{d}{d t} [\log (t)] - \log (t) \frac{d}{d t} [\log_{8} (t)]}{{\log_{8}}^{2} (t)}$

Step 2

The derivative of $\log (t)$ with respect to $t$ is $\frac{1}{t \ln (10)}$ .

$\frac{\log_{8} (t) \frac{1}{t \ln (10)} - \log (t) \frac{d}{d t} [\log_{8} (t)]}{{\log_{8}}^{2} (t)}$

Step 3

Combine $\log_{8} (t)$ and $\frac{1}{t \ln (10)}$ .

$\frac{\frac{\log_{8} (t)}{t \ln (10)} - \log (t) \frac{d}{d t} [\log_{8} (t)]}{{\log_{8}}^{2} (t)}$

Step 4

Multiply $\frac{\frac{\log_{8} (t)}{t \ln (10)} - \log (t) \frac{d}{d t} [\log_{8} (t)]}{{\log_{8}}^{2} (t)}$ by $\frac{t \ln (10)}{t \ln (10)}$ .

$\frac{t \ln (10)}{t \ln (10)} \cdot \frac{\frac{\log_{8} (t)}{t \ln (10)} - \log (t) \frac{d}{d t} [\log_{8} (t)]}{{\log_{8}}^{2} (t)}$

Step 5

Simplify terms.

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Step 5.1

Combine.

$\frac{t \ln (10) (\frac{\log_{8} (t)}{t \ln (10)} - \log (t) \frac{d}{d t} [\log_{8} (t)])}{t \ln (10) {\log_{8}}^{2} (t)}$

Step 5.2

Apply the distributive property.

$\frac{t \ln (10) \frac{\log_{8} (t)}{t \ln (10)} + t \ln (10) (- \log (t) \frac{d}{d t} [\log_{8} (t)])}{t \ln (10) {\log_{8}}^{2} (t)}$

Step 5.3

Cancel the common factor of $t \ln (10)$ .

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Step 5.3.1

Cancel the common factor.

$\frac{t \ln (10) \frac{\log_{8} (t)}{t \ln (10)} + t \ln (10) (- \log (t) \frac{d}{d t} [\log_{8} (t)])}{t \ln (10) {\log_{8}}^{2} (t)}$

Step 5.3.2

Rewrite the expression.

$\frac{\log_{8} (t) + t \ln (10) (- \log (t) \frac{d}{d t} [\log_{8} (t)])}{t \ln (10) {\log_{8}}^{2} (t)}$

Step 6

The derivative of $\log_{8} (t)$ with respect to $t$ is $\frac{1}{t \ln (8)}$ .

$\frac{\log_{8} (t) + t \ln (10) (- \log (t) \frac{1}{t \ln (8)})}{t \ln (10) {\log_{8}}^{2} (t)}$

Step 7

Simplify terms.

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Step 7.1

Combine $\frac{1}{t \ln (8)}$ and $\log (t)$ .

$\frac{\log_{8} (t) + t \ln (10) (- \frac{\log (t)}{t \ln (8)})}{t \ln (10) {\log_{8}}^{2} (t)}$

Step 7.2

Combine $t$ and $\frac{\log (t)}{t \ln (8)}$ .

$\frac{\log_{8} (t) + \ln (10) (- \frac{t \log (t)}{t \ln (8)})}{t \ln (10) {\log_{8}}^{2} (t)}$

Step 7.3

Combine $\ln (10)$ and $\frac{t \log (t)}{t \ln (8)}$ .

$\frac{\log_{8} (t) - \frac{\ln (10) (t \log (t))}{t \ln (8)}}{t \ln (10) {\log_{8}}^{2} (t)}$

Step 7.4

Cancel the common factor of $t$ .

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Step 7.4.1

Cancel the common factor.

$\frac{\log_{8} (t) - \frac{\ln (10) t \log (t)}{t \ln (8)}}{t \ln (10) {\log_{8}}^{2} (t)}$

Step 7.4.2

Rewrite the expression.

$\frac{\log_{8} (t) - \frac{\ln (10) \log (t)}{\ln (8)}}{t \ln (10) {\log_{8}}^{2} (t)}$

Step 7.5

Reorder terms.

$\frac{\log_{8} (t) - \frac{\ln (10) \log (t)}{\ln (8)}}{t {\log_{8}}^{2} (t) \ln (10)}$