Precalculus on Khan Academy: You may think that precalculus is simply the course you take before calculus. You would be right, of course, but that definition doesn’t mean anything unless you have some knowledge of what calculus is. Let’s keep it simple, shall we? Calculus is a conceptual framework which provides systematic techniques for solving problems. These problems are appropriately applicable to analytic geometry and algebra. Therefore….precalculus gives you the background for the mathematical concepts, problems, issues and techniques that appear in calculus, including trigonometry, functions, complex numbers, vectors, matrices, and others. There you have it ladies and gentlemen….an introduction to precalculus!

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Quadratic Equations in Standard Form Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algebra2/polynomial_and_rational/quad_formula_tutorial/e/quadratic_equation?utm_source=YT&utm_medium=Desc&utm_campaign=AlgebraI Watch the next lesson: https://www.khanacademy.org/math/algebra/quadratics/quadratic-formula/v/proof-of-quadratic-formula?utm_source=YT&utm_medium=Desc&utm_campaign=AlgebraI Missed the previous lesson? https://www.khanacademy.org/math/algebra/quadratics/quadratic-formula/v/using-the-quadratic-formula?utm_source=YT&utm_medium=Desc&utm_campaign=AlgebraI Algebra I on Khan Academy: Algebra is the language through which we describe patterns. Think of it as a shorthand, of sorts. As opposed to having to do something over and…

Before the United States had the Constitution, it had the Articles of Confederation, a much weaker government that lasted from 1777 to 1789. In this video, Kim and Leah discuss the pros and cons of the Articles, and the reasons they were discarded in favor of a new Constitution. View more lessons or practice this…