Geometric series | Sequences, series and induction | Precalculus | Khan Academy

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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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[@maxsotelo1089]

Amazing how his biggest problems are with what color he has to use

[@codysimspsonrox]

Khan Academy is my savior.

[@johnnylo]

amazing

[@tranduy8553]

thank you Sir

[@sumi942]

hi nice vid it helped

[@emenikeanigbogu9368]

good stuff

[@andrewb1986]

My God... I really wish I took Precalculus...

[@quosswimblik4489]

like with the triangle numbers there is a faster way to do at least some geometric series's faster than using sigma and that is if you convert all 1's in a given base to base 10.

[@bobjeff6779]

When you are doing this stuff in fifth grade but Khan Academy makes it so easy

[@nombulelomdlalose8972]

let say we only have fisrt term ,fourth term and we want the 9th term how can we get the ratio of rhe the sequence?

[@frede1905]

nombulelo mdlalose a_4/a_1=ar^3/a=r^3. Now you only have to take the cube root on both sides to get r.