Graph each function. See Example 2. ƒ(x) = 2^|x|

검증된 단계별 안내

Understand the function given: $f(x) = 2^{|x|}$. This means the output is 2 raised to the power of the absolute value of $x$.

Recall that the absolute value function $|x|$ makes all $x$ values non-negative, so for negative $x$, $|x| = -x$, and for non-negative $x$, $|x| = x$.

Rewrite the function as a piecewise function to understand its behavior on both sides of the y-axis: $f(x) = \begin{cases} 2^x & \text{if } x \geq 0 \\ 2^{-x} & \text{if } x < 0 \end{cases}$

Graph the right side ($x \geq 0$) using the exponential function \$2^x$, which increases as $x$ increases.

Graph the left side ($x < 0$) using $2^{-x}$, which is the reflection of \$2^x$ across the y-axis, ensuring the graph is symmetric about the y-axis.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Absolute Value Function

The absolute value function, denoted |x|, outputs the non-negative value of x, making all inputs positive or zero. It creates a V-shaped graph symmetric about the y-axis, affecting how the function behaves for negative and positive inputs.

Exponential Functions

Exponential functions have the form f(x) = a^x, where the base a is positive and not equal to 1. They exhibit rapid growth or decay, and their graphs pass through (0,1), reflecting the property that any number to the zero power equals one.

Graphing Composite Functions

Graphing composite functions like f(x) = 2^{|x|} involves understanding how the inner function (absolute value) transforms the input before applying the outer function (exponential). This results in a graph symmetric about the y-axis, combining properties of both functions.

Graph each function. See Example 2. ƒ(x) = 2|x|