In Exercises 19–32, find the (a) domain and (b) range.

𝔂 = |x| - 2

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Step 1: Identify the function type. The given function is 𝑦 = |𝑥| - 2, which is an absolute value function. Absolute value functions are defined for all real numbers.

Step 2: Determine the domain of the function. Since the absolute value function is defined for all real numbers, the domain of 𝑦 = |𝑥| - 2 is all real numbers, which can be expressed as (-∞, ∞).

Step 3: Analyze the transformation of the function. The function 𝑦 = |𝑥| - 2 is a vertical shift of the basic absolute value function 𝑦 = |𝑥|. The graph of 𝑦 = |𝑥| is shifted 2 units downward.

Step 4: Determine the range of the function. The basic absolute value function 𝑦 = |𝑥| has a range of [0, ∞). After shifting the graph 2 units downward, the range of 𝑦 = |𝑥| - 2 becomes [-2, ∞).

Step 5: Summarize the domain and range. The domain of the function 𝑦 = |𝑥| - 2 is all real numbers (-∞, ∞), and the range is [-2, ∞).

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주요 개념

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

Domain

The domain of a function refers to the set of all possible input values (x-values) for which the function is defined. For the function y = |x| - 2, the absolute value function |x| is defined for all real numbers, meaning the domain is all real numbers, or (-∞, ∞). Understanding the domain is crucial for determining the valid inputs for the function.

Range

The range of a function is the set of all possible output values (y-values) that the function can produce. In the case of y = |x| - 2, the minimum value occurs when |x| is zero, resulting in y = -2. As x increases or decreases, y increases without bound. Therefore, the range is [-2, ∞), indicating that y can take any value greater than or equal to -2.

Absolute Value Function

The absolute value function, denoted as |x|, outputs the non-negative value of x regardless of its sign. This means |x| is always zero or positive. In the function y = |x| - 2, the absolute value affects the shape of the graph, creating a V-like structure that opens upwards, shifted down by 2 units. Understanding this function is essential for analyzing the overall behavior of the given equation.

In Exercises 19–32, find the (a) domain and (b) range.𝔂 = |x| - 2