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  1. What is a function? (video) | Functions | Khan Academy

    Functions assign a single output for each of their inputs. In this video, we see examples of various kinds of functions.

  2. Functions | Algebra 1 | Math | Khan Academy

    About this unit A function is like a machine that takes an input and gives an output. Let's explore how we can graph, analyze, and create different types of functions. Unit guides are here! Power up your …

  3. Functions | College Algebra | Math | Khan Academy

    A function is like a machine that takes an input and gives an output. Let's explore how we can graph, analyze, and create different types of functions.

  4. Functions | Algebra (all content) | Math | Khan Academy

    Inputs and outputs of a function Learn Worked example: matching an input to a function's output (equation) Worked example: matching an input to a function's output (graph) Worked example: two …

  5. Quadratic functions & equations | Algebra 1 | Math | Khan Academy

    We've seen linear and exponential functions, and now we're ready for quadratic functions. We'll explore how these functions and the parabolas they produce can be used to solve real-world problems.

  6. Intro to rational expressions (article) | Khan Academy

    Example: Finding the domain of x + 1 (x 3) (x + 4) Let's find the zeros of the denominator and then restrict these values:

  7. Worked example: Evaluating functions from equation - Khan Academy

    Functions are evaluated at certain input values by replacing it with a number; for example, f(2) means the output at input 2. Instead of writing "x = 2, f = ...", we can just straight-up write "f(2) = ..."!

  8. What are multivariable functions? (article) | Khan Academy

    A multivariable function is just a function whose input and/or output is made up of multiple numbers. In contrast, a function with single-number inputs and single-number outputs is called a single-variable …

  9. Examples finding the domain of functions - Khan Academy

    - [Instructor] In this video, we're gonna do a few examples finding domains of functions. So let's say that we have the function f of x is equal to x plus five over x minus two.

  10. Rational functions (video) - Khan Academy

    What are rational functions? How do we plot them? What is their domain and range? Let's find out. We break down the definition of the function given in set-builder form and plot the graph by connecting …