The domain and range of a function are important because they help us understand the behavior of the function and its limitations. For example, the function f(x) = sin(x) has a range that is bounded between -1 and 1, because the sine function oscillates between these values. It is important to note that not all functions have a range that consists of all real numbers. We can then evaluate the function at these points to determine the maximum and minimum values and thus the range of the function. If the function is differentiable, we can find the critical points (where the derivative is equal to zero or undefined) and the endpoints of the domain. The vertex gives us the minimum or maximum value of the function, and the axis of symmetry tells us where the function is symmetric.Īnother way to find the range of a function is to use calculus. For example, if the function is a quadratic function, we can use the vertex form of the quadratic equation to determine the vertex and the axis of symmetry. One way to do this is to analyze the behavior of the function as the input variable varies. To find the range of a function, we need to determine the set of all possible output values. For example, if the range of a function is all real numbers between -1 and 1, including -1 and 1, we can write the range as. The range of a function can also be expressed using interval notation. The range of this function is all non-negative real numbers because x^2 is always non-negative. For example, consider the function f(x) = x^2. In other words, it is the set of values that the dependent variable can take on for different values of the independent variable. The range of a function is the set of all possible output values of the function. For example, if a function is undefined for x < 0, we can write the domain as [0, ∞). Once we have identified the restrictions on the input variable, we can express the domain of the function in interval notation.
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