Calculus Examples

$1 - 3 e^{- 3 x} = 0$

Step 1

Subtract $1$ from both sides of the equation.

$- 3 e^{- 3 x} = - 1$

Step 2

Divide each term in $- 3 e^{- 3 x} = - 1$ by $- 3$ and simplify.

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Step 2.1

Divide each term in $- 3 e^{- 3 x} = - 1$ by $- 3$ .

$\frac{- 3 e^{- 3 x}}{- 3} = \frac{- 1}{- 3}$

Step 2.2

Simplify the left side.

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Step 2.2.1

Cancel the common factor of $- 3$ .

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Step 2.2.1.1

Cancel the common factor.

$\frac{- 3 e^{- 3 x}}{- 3} = \frac{- 1}{- 3}$

Step 2.2.1.2

Divide $e^{- 3 x}$ by $1$ .

$e^{- 3 x} = \frac{- 1}{- 3}$

Step 2.3

Simplify the right side.

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Step 2.3.1

Dividing two negative values results in a positive value.

$e^{- 3 x} = \frac{1}{3}$

Step 3

Take the natural logarithm of both sides of the equation to remove the variable from the exponent.

$\ln (e^{- 3 x}) = \ln (\frac{1}{3})$

Step 4

Expand the left side.

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Step 4.1

Expand $\ln (e^{- 3 x})$ by moving $- 3 x$ outside the logarithm.

$- 3 x \ln (e) = \ln (\frac{1}{3})$

Step 4.2

The natural logarithm of $e$ is $1$ .

$- 3 x \cdot 1 = \ln (\frac{1}{3})$

Step 4.3

Multiply $- 3$ by $1$ .

$- 3 x = \ln (\frac{1}{3})$

Step 5

Divide each term in $- 3 x = \ln (\frac{1}{3})$ by $- 3$ and simplify.

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Step 5.1

Divide each term in $- 3 x = \ln (\frac{1}{3})$ by $- 3$ .

$\frac{- 3 x}{- 3} = \frac{\ln (\frac{1}{3})}{- 3}$

Step 5.2

Simplify the left side.

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Step 5.2.1

Cancel the common factor of $- 3$ .

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Step 5.2.1.1

Cancel the common factor.

$\frac{- 3 x}{- 3} = \frac{\ln (\frac{1}{3})}{- 3}$

Step 5.2.1.2

Divide $x$ by $1$ .

$x = \frac{\ln (\frac{1}{3})}{- 3}$

Step 5.3

Simplify the right side.

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Step 5.3.1

Move the negative in front of the fraction.

$x = - \frac{\ln (\frac{1}{3})}{3}$

Step 6

The result can be shown in multiple forms.

Exact Form:

$x = - \frac{\ln (\frac{1}{3})}{3}$

Decimal Form:

$x = 0.36620409 \dots$