Graph Using a Table of Values f(x)=-2^(-x)

$f (x) = - 2^{- x}$

Step 1

Substitute $- 2$ for $x$ and find the result for $y$ .

$y = - 2^{- (- 2)}$

Step 2

Simplify $- 2^{- (- 2)}$ .

Multiply $- 1$ by $- 2$ .

$y = - 2^{2}$

Raise $2$ to the power of $2$ .

$y = - 1 \cdot 4$

Multiply $- 1$ by $4$ .

$y = - 4$

Step 3

Substitute $- 1$ for $x$ and find the result for $y$ .

$y = - 2^{- (- 1)}$

Step 4

Simplify $- 2^{- (- 1)}$ .

Multiply $- 1$ by $- 1$ .

$y = - 2^{1}$

Evaluate the exponent.

$y = - 1 \cdot 2$

Multiply $- 1$ by $2$ .

$y = - 2$

Step 5

Substitute $0$ for $x$ and find the result for $y$ .

$y = - 2^{- (0)}$

Step 6

Simplify $- 2^{- (0)}$ .

Multiply $- 1$ by $0$ .

$y = - 2^{0}$

Anything raised to $0$ is $1$ .

$y = - 1 \cdot 1$

Multiply $- 1$ by $1$ .

$y = - 1$

Step 7

Substitute $1$ for $x$ and find the result for $y$ .

$y = - 2^{- (1)}$

Step 8

Simplify $- 2^{- (1)}$ .

Multiply $- 1$ by $1$ .

$y = - 2^{- 1}$

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

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

Step 9

Substitute $2$ for $x$ and find the result for $y$ .

$y = - 2^{- (2)}$

Step 10

Simplify $- 2^{- (2)}$ .

Multiply $- 1$ by $2$ .

$y = - 2^{- 2}$

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

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

Raise $2$ to the power of $2$ .

$y = - \frac{1}{4}$

Step 11

This is a table of possible values to use when graphing the equation.

$\begin{array}{c} x & y \\ - 2 & - 4 \\ - 1 & - 2 \\ 0 & - 1 \\ 1 & - \frac{1}{2} \\ 2 & - \frac{1}{4} \end{array}$

Step 12

Graph Using a Table of Values f(x)=-2^(-x)

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