Precalculus Examples

$\frac{1}{2} (\log (x + 2) + \log (x + 3)) - \log (x + 5) - 8 \log (3 x - 8)$

Step 1

Simplify each term.

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Step 1.1

Use the product property of logarithms, $\log_{b} (x) + \log_{b} (y) = \log_{b} (x y)$ .

$\frac{1}{2} \cdot \log ((x + 2) (x + 3)) - \log (x + 5) - 8 \log (3 x - 8)$

Step 1.2

Expand $(x + 2) (x + 3)$ using the FOIL Method.

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Step 1.2.1

Apply the distributive property.

$\frac{1}{2} \cdot \log (x (x + 3) + 2 (x + 3)) - \log (x + 5) - 8 \log (3 x - 8)$

Step 1.2.2

Apply the distributive property.

$\frac{1}{2} \cdot \log (x \cdot x + x \cdot 3 + 2 (x + 3)) - \log (x + 5) - 8 \log (3 x - 8)$

Step 1.2.3

Apply the distributive property.

$\frac{1}{2} \cdot \log (x \cdot x + x \cdot 3 + 2 x + 2 \cdot 3) - \log (x + 5) - 8 \log (3 x - 8)$

Step 1.3

Simplify and combine like terms.

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Step 1.3.1

Simplify each term.

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Step 1.3.1.1

Multiply $x$ by $x$ .

$\frac{1}{2} \cdot \log (x^{2} + x \cdot 3 + 2 x + 2 \cdot 3) - \log (x + 5) - 8 \log (3 x - 8)$

Step 1.3.1.2

Move $3$ to the left of $x$ .

$\frac{1}{2} \cdot \log (x^{2} + 3 \cdot x + 2 x + 2 \cdot 3) - \log (x + 5) - 8 \log (3 x - 8)$

Step 1.3.1.3

Multiply $2$ by $3$ .

$\frac{1}{2} \cdot \log (x^{2} + 3 x + 2 x + 6) - \log (x + 5) - 8 \log (3 x - 8)$

Step 1.3.2

Add $3 x$ and $2 x$ .

$\frac{1}{2} \cdot \log (x^{2} + 5 x + 6) - \log (x + 5) - 8 \log (3 x - 8)$

Step 1.4

Simplify $\frac{1}{2} \log (x^{2} + 5 x + 6)$ by moving $\frac{1}{2}$ inside the logarithm.

$\log ({(x^{2} + 5 x + 6)}^{\frac{1}{2}}) - \log (x + 5) - 8 \log (3 x - 8)$

Step 1.5

Simplify $- 8 \log (3 x - 8)$ by moving $8$ inside the logarithm.

$\log ({(x^{2} + 5 x + 6)}^{\frac{1}{2}}) - \log (x + 5) - \log ({(3 x - 8)}^{8})$

Step 2

Use the quotient property of logarithms, $\log_{b} (x) - \log_{b} (y) = \log_{b} (\frac{x}{y})$ .

$\log (\frac{{(x^{2} + 5 x + 6)}^{\frac{1}{2}}}{x + 5}) - \log ({(3 x - 8)}^{8})$

Step 3

Use the quotient property of logarithms, $\log_{b} (x) - \log_{b} (y) = \log_{b} (\frac{x}{y})$ .

$\log (\frac{\frac{{(x^{2} + 5 x + 6)}^{\frac{1}{2}}}{x + 5}}{{(3 x - 8)}^{8}})$

Step 4

Multiply the numerator by the reciprocal of the denominator.

$\log (\frac{{(x^{2} + 5 x + 6)}^{\frac{1}{2}}}{x + 5} \cdot \frac{1}{{(3 x - 8)}^{8}})$

Step 5

Multiply $\frac{{(x^{2} + 5 x + 6)}^{\frac{1}{2}}}{x + 5}$ by $\frac{1}{{(3 x - 8)}^{8}}$ .

$\log (\frac{{(x^{2} + 5 x + 6)}^{\frac{1}{2}}}{(x + 5) {(3 x - 8)}^{8}})$