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Learn how to replace variables with numbers or expressions in functions. See examples, tips and exercises on evaluating functions for different values and expressions.
- Substitution
As that last example showed, we may not always get a number...
- Definitions
That equation says: what is on the left (x + 2) is equal to...
- Substitution
Enter a function and get instant feedback on its domain, range, intercepts, extreme points and asymptotes. The calculator also shows the steps and formulas used to evaluate the function.
Learn how to evaluate, graph, and create different types of functions, such as linear, quadratic, exponential, and rational. Test your knowledge with quizzes, practice problems, and unit test.
Learn how to evaluate, graph, and combine functions, and how to identify and apply inverse functions. This unit covers topics such as domain and range, average rate of change, function transformations, and piecewise functions.
Microsoft Teams. g ( r) = 25 − 3 r. g ( 4) =. 0:59. Report a problem. Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.
So far, you have evaluated functions for inputs that have been constants. Functions can also be evaluated for inputs that are variables or expressions. The process is the same, but the simplified answer will contain a variable. The following examples show how to evaluate a function for a variable input.
Use functional notation to evaluate a function. Determine the domain and range of a function. Draw the graph of a function. Find the zeros of a function. Recognize a function from a table of values. Make new functions from two or more given functions. Describe the symmetry properties of a function.
