Unit vectors | Vectors | Precalculus | Khan Academy

Missed the previous lesson?

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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[ashremoses]

How did my teacher manage to make this sound so complicated

[-_-_]

Finally a video that explained it in simpler terms. Thanks so much.

[mirnadany]

thank you so much, I'm in first year of college, faculty of science and I have my final exams after 2 weeks thank you for helping everyone of us, thank you for those who haven't left a comment thanking you

[Adriancfl]

Thank you Khan Academy!!! I've been struggling with this all the time cause my Prof uses too mathematical terms. Your videos (maths & other subjects) always help and teach me alot! Thanks!

[KH-eyce]

I never understood this until now, you are AMAZING!!!

[nemotamang]

Honestly, this explanation is too simple, straight-forward & effective that it feels unreal. (Wish I had seen it sooner)
Thanks a lot.🙏

[samueljohn]

thanks a lot sir !!!! for that fabulous teaching of yours thanks a lot
I dont know how i can repay you
here in India today is teachers day so all my heart i think you are my teacher
so happy teachers day sir,
yours bigest fan

[kachingaaa]

wth i saw this yesterday for the first time at uni and i was looking in khan academy and found this just a minute after it was posted. i'm kinda scared actually haha

[DharmaanAcademy]

Bundles of thanks brother, your struggles in the education field really make our life easier.

[augustsophomore]

Can someone whisper me into ear why we need this freakin unit vector

[dhoojxq]

thank you for the video, it was of great help

[shrek]

When your teacher fails to explain things yet gives us students homework with it, then it's good we got Khan Academy to safe us

[tabdesign]

Every topic i've study with you are really helpful to me. Thanks

[DivshaR-hxim]

i can finally understand why the formula is what it is, cause we're scaling everything down by the magnitude to get unit length. thanks sal, you make things so much better

[abel_kidus]

A 5 minute video just made me understand something that confused me for a whole year. Thanks Khan Academy!

[atheerkhalaf]

i always knew how to calculate it but i never understood why we do it, now i do, thanks for making it easier.

[harishbabuk.s]

Now only got to know exactly what unit vectors means. Thanks for the amazing explanation sir !!!!

[badymojoy]

Fabulous explanation, Sal. On behalf of all humanity, thank you.

[xtnmay]

Why don't you come in my school? My prof. Just alomost skip the topic by reading it. And your explaination makes my mind crystal clear. Thanks a lot !

[musiklxver]

Thanks sir for this, you are really amazing keep up the work.