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  1. Khan Academy

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  2. Rational functions (video) | Set Theory | 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 …

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

    Functions are a type of relation and are most useful to analyse quantities and be graphed. The concept of functions mapping input onto (at most) 1 output separates functions from equations.

  4. Polynomial expressions, equations, & functions | Khan Academy

    This topic covers: - Adding, subtracting, and multiplying polynomial expressions - Factoring polynomial expressions as the product of linear factors - Dividing polynomial expressions - …

  5. Algebra 2 | Math | Khan Academy

    The Algebra 2 course, often taught in the 11th grade, covers Polynomials; Complex Numbers; Rational Exponents; Exponential and Logarithmic Functions; Trigonometric Functions; …

  6. Algebra 1 | Math | Khan Academy

    The Algebra 1 course, often taught in the 9th grade, covers Linear equations, inequalities, functions, and graphs; Systems of equations and inequalities; Extension of the concept of a …

  7. Quadratic equations & functions | Algebra (all content) | Khan …

    This topic covers: - Solving quadratic equations - Graphing quadratic functions - Features of quadratic functions - Quadratic equations/functions word problems - Systems of quadratic …

  8. Linear Functions – Khan Academy Help Center

    Let f(x) be defined for any positive integer x greater than 2 as the sum of all prime numbers less than x. For example, f(4)=2+3=5 and f(8)=2+3+5+7=17. What is the value of f(86)−f(82)?

  9. 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 …

  10. Domain of advanced functions (practice) | Khan Academy

    Determine the domain of functions whose expressions are a combination of different types of assignment rules.