Calculus Examples

$f (x) = D \cdot (m \cdot \log (\frac{x \cdot (\frac{1}{D}) - x \cdot C \cdot B}{c}) - x \cdot B + b)$

Step 1

Combine $x$ and $\frac{1}{D}$ .

$\frac{d}{d D} [D \cdot (m \cdot \log (\frac{\frac{x}{D} - x \cdot C \cdot B}{c}) - x \cdot B + b)]$

Step 2

Multiply $\frac{\frac{x}{D} - x C B}{c}$ by $\frac{D}{D}$ .

$\frac{d}{d D} [D \cdot (m \cdot \log (\frac{D}{D} \cdot \frac{\frac{x}{D} - x C B}{c}) - x \cdot B + b)]$

Step 3

Simplify terms.

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Combine.

$\frac{d}{d D} [D \cdot (m \cdot \log (\frac{D (\frac{x}{D} - x C B)}{D c}) - x \cdot B + b)]$

Apply the distributive property.

$\frac{d}{d D} [D \cdot (m \cdot \log (\frac{D \frac{x}{D} + D (- x C B)}{D c}) - x \cdot B + b)]$

Cancel the common factor of $D$ .

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Cancel the common factor.

$\frac{d}{d D} [D \cdot (m \cdot \log (\frac{D \frac{x}{D} + D (- x C B)}{D c}) - x \cdot B + b)]$

Rewrite the expression.

$\frac{d}{d D} [D \cdot (m \cdot \log (\frac{x + D (- x C B)}{D c}) - x \cdot B + b)]$

Step 4

Differentiate using the Product Rule which states that $\frac{d}{d D} [f (D) g (D)]$ is $f (D) \frac{d}{d D} [g (D)] + g (D) \frac{d}{d D} [f (D)]$ where $f (D) = D$ and $g (D) = m \log (\frac{x + D (- x C B)}{D c}) - x B + b$ .

$D \frac{d}{d D} [m \log (\frac{x + D (- x C B)}{D c}) - x B + b] + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Step 5

Differentiate.

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By the Sum Rule, the derivative of $m \log (\frac{x + D (- x C B)}{D c}) - x B + b$ with respect to $D$ is $\frac{d}{d D} [m \log (\frac{x + D (- x C B)}{D c})] + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]$ .

$D (\frac{d}{d D} [m \log (\frac{x + D (- x C B)}{D c})] + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Since $m$ is constant with respect to $D$ , the derivative of $m \log (\frac{x + D (- x C B)}{D c})$ with respect to $D$ is $m \frac{d}{d D} [\log (\frac{x + D (- x C B)}{D c})]$ .

$D (m \frac{d}{d D} [\log (\frac{x + D (- x C B)}{D c})] + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Step 6

Differentiate using the chain rule, which states that $\frac{d}{d D} [f (g (D))]$ is $f' (g (D)) g' (D)$ where $f (D) = \log (D)$ and $g (D) = \frac{x + D (- x C B)}{D c}$ .

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To apply the Chain Rule, set $u$ as $\frac{x + D (- x C B)}{D c}$ .

$D (m (\frac{d}{d u} [\log (u)] \frac{d}{d D} [\frac{x + D (- x C B)}{D c}]) + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

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

$D (m (\frac{1}{u \ln (10)} \frac{d}{d D} [\frac{x + D (- x C B)}{D c}]) + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Replace all occurrences of $u$ with $\frac{x + D (- x C B)}{D c}$ .

$D (m (\frac{1}{\frac{x + D (- x C B)}{D c} \ln (10)} \frac{d}{d D} [\frac{x + D (- x C B)}{D c}]) + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Step 7

Combine $\frac{x + D (- x C B)}{D c}$ and $\ln (10)$ .

$D (m (\frac{1}{\frac{(x + D (- x C B)) \ln (10)}{D c}} \frac{d}{d D} [\frac{x + D (- x C B)}{D c}]) + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Step 8

Multiply by the reciprocal of the fraction to divide by $\frac{(x + D (- x C B)) \ln (10)}{D c}$ .

$D (m (1 \frac{D c}{(x + D (- x C B)) \ln (10)} \frac{d}{d D} [\frac{x + D (- x C B)}{D c}]) + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Step 9

Differentiate using the Constant Multiple Rule.

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Multiply $\frac{D c}{(x + D (- x C B)) \ln (10)}$ by $1$ .

$D (m (\frac{D c}{(x + D (- x C B)) \ln (10)} \frac{d}{d D} [\frac{x + D (- x C B)}{D c}]) + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Combine $\frac{D c}{(x + D (- x C B)) \ln (10)}$ and $m$ .

$D (\frac{D c m}{(x + D (- x C B)) \ln (10)} \frac{d}{d D} [\frac{x + D (- x C B)}{D c}] + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Since $\frac{1}{c}$ is constant with respect to $D$ , the derivative of $\frac{x + D (- x C B)}{D c}$ with respect to $D$ is $\frac{1}{c} \frac{d}{d D} [\frac{x + D (- x C B)}{D}]$ .

$D (\frac{D c m}{(x + D (- x C B)) \ln (10)} (\frac{1}{c} \frac{d}{d D} [\frac{x + D (- x C B)}{D}]) + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Simplify terms.

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Multiply $\frac{1}{c}$ by $\frac{D c m}{(x + D (- x C B)) \ln (10)}$ .

$D (\frac{D c m}{c ((x + D (- x C B)) \ln (10))} \frac{d}{d D} [\frac{x + D (- x C B)}{D}] + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Cancel the common factor of $c$ .

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Cancel the common factor.

$D (\frac{D c m}{c (x + D (- x C B)) \ln (10)} \frac{d}{d D} [\frac{x + D (- x C B)}{D}] + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Rewrite the expression.

$D (\frac{D m}{(x + D (- x C B)) \ln (10)} \frac{d}{d D} [\frac{x + D (- x C B)}{D}] + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Step 10

Differentiate using the Quotient Rule which states that $\frac{d}{d D} [\frac{f (D)}{g (D)}]$ is $\frac{g (D) \frac{d}{d D} [f (D)] - f (D) \frac{d}{d D} [g (D)]}{{g (D)}^{2}}$ where $f (D) = x + D (- x C B)$ and $g (D) = D$ .

$D (\frac{D m}{(x + D (- x C B)) \ln (10)} \cdot \frac{D \frac{d}{d D} [x + D (- x C B)] - (x + D (- x C B)) \frac{d}{d D} [D]}{D^{2}} + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Step 11

Differentiate.

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By the Sum Rule, the derivative of $x + D (- x C B)$ with respect to $D$ is $\frac{d}{d D} [x] + \frac{d}{d D} [D (- x C B)]$ .

$D (\frac{D m}{(x + D (- x C B)) \ln (10)} \cdot \frac{D (\frac{d}{d D} [x] + \frac{d}{d D} [D (- x C B)]) - (x + D (- x C B)) \frac{d}{d D} [D]}{D^{2}} + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Since $x$ is constant with respect to $D$ , the derivative of $x$ with respect to $D$ is $0$ .

$D (\frac{D m}{(x + D (- x C B)) \ln (10)} \cdot \frac{D (0 + \frac{d}{d D} [D (- x C B)]) - (x + D (- x C B)) \frac{d}{d D} [D]}{D^{2}} + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Add $0$ and $\frac{d}{d D} [D (- x C B)]$ .

$D (\frac{D m}{(x + D (- x C B)) \ln (10)} \cdot \frac{D \frac{d}{d D} [D (- x C B)] - (x + D (- x C B)) \frac{d}{d D} [D]}{D^{2}} + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Since $- x C B$ is constant with respect to $D$ , the derivative of $D (- x C B)$ with respect to $D$ is $- x C B \frac{d}{d D} [D]$ .

$D (\frac{D m}{(x + D (- x C B)) \ln (10)} \cdot \frac{D (- x C B \frac{d}{d D} [D]) - (x + D (- x C B)) \frac{d}{d D} [D]}{D^{2}} + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Differentiate using the Power Rule which states that $\frac{d}{d D} [D^{n}]$ is $n D^{n - 1}$ where $n = 1$ .

$D (\frac{D m}{(x + D (- x C B)) \ln (10)} \cdot \frac{D (- x C B \cdot 1) - (x + D (- x C B)) \frac{d}{d D} [D]}{D^{2}} + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Multiply $- 1$ by $1$ .

$D (\frac{D m}{(x + D (- x C B)) \ln (10)} \cdot \frac{D (- x C B) - (x + D (- x C B)) \frac{d}{d D} [D]}{D^{2}} + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Differentiate using the Power Rule which states that $\frac{d}{d D} [D^{n}]$ is $n D^{n - 1}$ where $n = 1$ .

$D (\frac{D m}{(x + D (- x C B)) \ln (10)} \cdot \frac{D (- x C B) - (x + D (- x C B)) \cdot 1}{D^{2}} + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Simplify terms.

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Multiply $- 1$ by $1$ .

$D (\frac{D m}{(x + D (- x C B)) \ln (10)} \cdot \frac{D (- x C B) - (x + D (- x C B))}{D^{2}} + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Multiply $\frac{D m}{(x + D (- x C B)) \ln (10)}$ by $\frac{D (- x C B) - (x + D (- x C B))}{D^{2}}$ .

$D (\frac{D m (D (- x C B) - (x + D (- x C B)))}{(x + D (- x C B)) \ln (10) D^{2}} + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Cancel the common factor of $D$ and $D^{2}$ .

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Factor $D$ out of $D m (D (- x C B) - (x + D (- x C B)))$ .

$D (\frac{D (m (D (- x C B) - (x + D (- x C B))))}{(x + D (- x C B)) \ln (10) D^{2}} + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Cancel the common factors.

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Factor $D$ out of $(x + D (- x C B)) \ln (10) D^{2}$ .

$D (\frac{D (m (D (- x C B) - (x + D (- x C B))))}{D ((x + D (- x C B)) \ln (10) D)} + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Cancel the common factor.

$D (\frac{D (m (D (- x C B) - (x + D (- x C B))))}{D ((x + D (- x C B)) \ln (10) D)} + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Rewrite the expression.

$D (\frac{m (D (- x C B) - (x + D (- x C B)))}{(x + D (- x C B)) \ln (10) D} + \frac{d}{d D} [- x B] + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Since $- x B$ is constant with respect to $D$ , the derivative of $- x B$ with respect to $D$ is $0$ .

$D (\frac{m (D (- x C B) - (x + D (- x C B)))}{(x + D (- x C B)) \ln (10) D} + 0 + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Add $\frac{m (D (- x C B) - (x + D (- x C B)))}{(x + D (- x C B)) \ln (10) D}$ and $0$ .

$D (\frac{m (D (- x C B) - (x + D (- x C B)))}{(x + D (- x C B)) \ln (10) D} + \frac{d}{d D} [b]) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Since $b$ is constant with respect to $D$ , the derivative of $b$ with respect to $D$ is $0$ .

$D (\frac{m (D (- x C B) - (x + D (- x C B)))}{(x + D (- x C B)) \ln (10) D} + 0) + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Simplify terms.

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Add $\frac{m (D (- x C B) - (x + D (- x C B)))}{(x + D (- x C B)) \ln (10) D}$ and $0$ .

$D \frac{m (D (- x C B) - (x + D (- x C B)))}{(x + D (- x C B)) \ln (10) D} + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Combine $D$ and $\frac{m (D (- x C B) - (x + D (- x C B)))}{(x + D (- x C B)) \ln (10) D}$ .

$\frac{D (m (D (- x C B) - (x + D (- x C B))))}{(x + D (- x C B)) \ln (10) D} + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Cancel the common factor of $D$ .

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Cancel the common factor.

$\frac{D (m (D (- x C B) - (x + D (- x C B))))}{(x + D (- x C B)) \ln (10) D} + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Rewrite the expression.

$\frac{m (D (- x C B) - (x + D (- x C B)))}{(x + D (- x C B)) \ln (10)} + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \frac{d}{d D} [D]$

Differentiate using the Power Rule which states that $\frac{d}{d D} [D^{n}]$ is $n D^{n - 1}$ where $n = 1$ .

$\frac{m (D (- x C B) - (x + D (- x C B)))}{(x + D (- x C B)) \ln (10)} + (m \log (\frac{x + D (- x C B)}{D c}) - x B + b) \cdot 1$

Multiply $m \log (\frac{x + D (- x C B)}{D c}) - x B + b$ by $1$ .

$\frac{m (D (- x C B) - (x + D (- x C B)))}{(x + D (- x C B)) \ln (10)} + m \log (\frac{x + D (- x C B)}{D c}) - x B + b$

Step 12

To write $m \log (\frac{x + D (- x C B)}{D c})$ as a fraction with a common denominator, multiply by $\frac{(x + D (- x C B)) \ln (10)}{(x + D (- x C B)) \ln (10)}$ .

$\frac{m (D (- x C B) - (x + D (- x C B)))}{(x + D (- x C B)) \ln (10)} + m \log (\frac{x + D (- x C B)}{D c}) \cdot \frac{(x + D (- x C B)) \ln (10)}{(x + D (- x C B)) \ln (10)} - x B + b$

Step 13

Combine $m \log (\frac{x + D (- x C B)}{D c})$ and $\frac{(x + D (- x C B)) \ln (10)}{(x + D (- x C B)) \ln (10)}$ .

$\frac{m (D (- x C B) - (x + D (- x C B)))}{(x + D (- x C B)) \ln (10)} + \frac{m \log (\frac{x + D (- x C B)}{D c}) ((x + D (- x C B)) \ln (10))}{(x + D (- x C B)) \ln (10)} - x B + b$

Step 14

Combine the numerators over the common denominator.

$\frac{m (D (- x C B) - (x + D (- x C B))) + m \log (\frac{x + D (- x C B)}{D c}) ((x + D (- x C B)) \ln (10))}{(x + D (- x C B)) \ln (10)} - x B + b$

Step 15

Simplify.

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Apply the distributive property.

$\frac{m (D (- x C B) - x - (D (- x C B))) + m \log (\frac{x + D (- x C B)}{D c}) ((x + D (- x C B)) \ln (10))}{(x + D (- x C B)) \ln (10)} - x B + b$

Apply the distributive property.

$\frac{m (D (- x C B)) + m (- x) + m (- (D (- x C B))) + m \log (\frac{x + D (- x C B)}{D c}) ((x + D (- x C B)) \ln (10))}{(x + D (- x C B)) \ln (10)} - x B + b$

Apply the distributive property.

$\frac{m (D (- x C B)) + m (- x) + m (- (D (- x C B))) + m \log (\frac{x + D (- x C B)}{D c}) (x \ln (10) + D (- x C B) \ln (10))}{(x + D (- x C B)) \ln (10)} - x B + b$

Apply the distributive property.

$\frac{m (D (- x C B)) + m (- x) + m (- (D (- x C B))) + m \log (\frac{x + D (- x C B)}{D c}) (x \ln (10) + D (- x C B) \ln (10))}{x \ln (10) + D (- x C B) \ln (10)} - x B + b$

Combine terms.

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Multiply $- 1$ by $- 1$ .

$\frac{m D (- x C B) + m (- x) + m (1 (D (x C B))) + m \log (\frac{x + D (- x C B)}{D c}) (x \ln (10) + D (- x C B) \ln (10))}{x \ln (10) + D (- x C B) \ln (10)} - x B + b$

Multiply $D$ by $1$ .

$\frac{m D (- x C B) + m (- x) + m (D (x C B)) + m \log (\frac{x + D (- x C B)}{D c}) (x \ln (10) + D (- x C B) \ln (10))}{x \ln (10) + D (- x C B) \ln (10)} - x B + b$

Move $C$ .

$\frac{m (- x) - 1 \cdot m x B C D + m x B C D + m \log (\frac{x + D (- x C B)}{D c}) (x \ln (10) + D (- x C B) \ln (10))}{x \ln (10) + D (- x C B) \ln (10)} - x B + b$

Rewrite $- 1 m$ as $- m$ .

$\frac{m (- x) - m x B C D + m x B C D + m \log (\frac{x + D (- x C B)}{D c}) (x \ln (10) + D (- x C B) \ln (10))}{x \ln (10) + D (- x C B) \ln (10)} - x B + b$

Add $- m x B C D$ and $m x B C D$ .

$\frac{m (- x) + 0 + m \log (\frac{x + D (- x C B)}{D c}) (x \ln (10) + D (- x C B) \ln (10))}{x \ln (10) + D (- x C B) \ln (10)} - x B + b$

Add $m (- x)$ and $0$ .

$\frac{m (- x) + m \log (\frac{x + D (- x C B)}{D c}) (x \ln (10) + D (- x C B) \ln (10))}{x \ln (10) + D (- x C B) \ln (10)} - x B + b$

To write $- x B$ as a fraction with a common denominator, multiply by $\frac{x \ln (10) + D (- x C B) \ln (10)}{x \ln (10) + D (- x C B) \ln (10)}$ .

$\frac{m (- x) + m \log (\frac{x + D (- x C B)}{D c}) (x \ln (10) + D (- x C B) \ln (10))}{x \ln (10) + D (- x C B) \ln (10)} - x B \cdot \frac{x \ln (10) + D (- x C B) \ln (10)}{x \ln (10) + D (- x C B) \ln (10)} + b$

Combine $- x B$ and $\frac{x \ln (10) + D (- x C B) \ln (10)}{x \ln (10) + D (- x C B) \ln (10)}$ .

$\frac{m (- x) + m \log (\frac{x + D (- x C B)}{D c}) (x \ln (10) + D (- x C B) \ln (10))}{x \ln (10) + D (- x C B) \ln (10)} + \frac{- x B (x \ln (10) + D (- x C B) \ln (10))}{x \ln (10) + D (- x C B) \ln (10)} + b$

Combine the numerators over the common denominator.

$\frac{m (- x) + m \log (\frac{x + D (- x C B)}{D c}) (x \ln (10) + D (- x C B) \ln (10)) - x B (x \ln (10) + D (- x C B) \ln (10))}{x \ln (10) + D (- x C B) \ln (10)} + b$

To write $b$ as a fraction with a common denominator, multiply by $\frac{x \ln (10) + D (- x C B) \ln (10)}{x \ln (10) + D (- x C B) \ln (10)}$ .

$\frac{m (- x) + m \log (\frac{x + D (- x C B)}{D c}) (x \ln (10) + D (- x C B) \ln (10)) - x B (x \ln (10) + D (- x C B) \ln (10))}{x \ln (10) + D (- x C B) \ln (10)} + \frac{b (x \ln (10) + D (- x C B) \ln (10))}{x \ln (10) + D (- x C B) \ln (10)}$

Combine the numerators over the common denominator.

$\frac{m (- x) + m \log (\frac{x + D (- x C B)}{D c}) (x \ln (10) + D (- x C B) \ln (10)) - x B (x \ln (10) + D (- x C B) \ln (10)) + b (x \ln (10) + D (- x C B) \ln (10))}{x \ln (10) + D (- x C B) \ln (10)}$

Reorder terms.

$\frac{- m x + m \log (\frac{x + D (- x C B)}{D c}) (x \ln (10) + D (- x C B) \ln (10)) - B x (x \ln (10) + D (- x C B) \ln (10)) + b (x \ln (10) + D (- x C B) \ln (10))}{x \ln (10) - B C D x \ln (10)}$