Find the x and y Intercepts f(x)=1/2*e^(-x)-1

$f (x) = \frac{1}{2} \cdot e^{- x} - 1$

Step 1

Find the x-intercepts.

To find the x-intercept(s), substitute in $0$ for $y$ and solve for $x$ .

$0 = \frac{1}{2} \cdot e^{- x} - 1$

Solve the equation.

Rewrite the equation as $\frac{1}{2} \cdot e^{- x} - 1 = 0$ .

$\frac{1}{2} \cdot e^{- x} - 1 = 0$

Combine $\frac{1}{2}$ and $e^{- x}$ .

$\frac{e^{- x}}{2} - 1 = 0$

Add $1$ to both sides of the equation.

$\frac{e^{- x}}{2} = 1$

Multiply both sides by $2$ .

$\frac{e^{- x}}{2} \cdot 2 = 1 \cdot 2$

Simplify.

Simplify the left side.

Cancel the common factor of $2$ .

Cancel the common factor.

$\frac{e^{- x}}{2} \cdot 2 = 1 \cdot 2$

Rewrite the expression.

$e^{- x} = 1 \cdot 2$

Simplify the right side.

Multiply $2$ by $1$ .

$e^{- x} = 2$

Solve for $x$ .

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

$\ln (e^{- x}) = \ln (2)$

Expand the left side.

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

$- x \ln (e) = \ln (2)$

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

$- x \cdot 1 = \ln (2)$

Multiply $- 1$ by $1$ .

$- x = \ln (2)$

Divide each term in $- x = \ln (2)$ by $- 1$ and simplify.

Divide each term in $- x = \ln (2)$ by $- 1$ .

$\frac{- x}{- 1} = \frac{\ln (2)}{- 1}$

Simplify the left side.

Dividing two negative values results in a positive value.

$\frac{x}{1} = \frac{\ln (2)}{- 1}$

Divide $x$ by $1$ .

$x = \frac{\ln (2)}{- 1}$

Simplify the right side.

Move the negative one from the denominator of $\frac{\ln (2)}{- 1}$ .

$x = - 1 \cdot \ln (2)$

Rewrite $- 1 \cdot \ln (2)$ as $- \ln (2)$ .

$x = - \ln (2)$

x-intercept(s) in point form.

x-intercept(s): $(- \ln (2), 0)$

Step 2

Find the y-intercepts.

To find the y-intercept(s), substitute in $0$ for $x$ and solve for $y$ .

$y = \frac{1}{2} \cdot e^{- (0)} - 1$

Simplify $\frac{1}{2} \cdot e^{- (0)} - 1$ .

Simplify each term.

Multiply $- 1$ by $0$ .

$y = \frac{1}{2} \cdot e^{0} - 1$

Anything raised to $0$ is $1$ .

$y = \frac{1}{2} \cdot 1 - 1$

Multiply $\frac{1}{2}$ by $1$ .

$y = \frac{1}{2} - 1$

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$y = \frac{1}{2} - 1 \cdot \frac{2}{2}$

Combine $- 1$ and $\frac{2}{2}$ .

$y = \frac{1}{2} + \frac{- 1 \cdot 2}{2}$

Combine the numerators over the common denominator.

$y = \frac{1 - 1 \cdot 2}{2}$

Simplify the numerator.

Multiply $- 1$ by $2$ .

$y = \frac{1 - 2}{2}$

Subtract $2$ from $1$ .

$y = \frac{- 1}{2}$

Move the negative in front of the fraction.

$y = - \frac{1}{2}$

y-intercept(s) in point form.

y-intercept(s): $(0, - \frac{1}{2})$

Step 3

List the intersections.

x-intercept(s): $(- \ln (2), 0)$

y-intercept(s): $(0, - \frac{1}{2})$

Step 4

Find the x and y Intercepts f(x)=1/2*e^(-x)-1

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