Chain Rule Example 4 (KristaKingMath)

Chain Rule calculus example.

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Hi, I’m Krista! I make math courses to keep you from banging your head against the wall. ;)

Math class was always so frustrating for me. I’d go to a class, spend hours on homework, and three days later have an “Ah-ha!” moment about how the problems worked that could have slashed my homework time in half. I’d think, “WHY didn’t my teacher just tell me this in the first place?!”

[freedomvader]

Thank you very much! I was getting frustrated with the homework, but this video helped so much.

[melissac]

I am so glad that I found your channel! You make this so much easier to understand than my calc teacher does at Campbell U. I still really, really despise math, but at least I can attempt to not fail my calc test this Friday! Thank you ~~

[kristakingmath]

lol... i totally understand! i hope you kick butt on your test and can get through the rest of the semester so that you can move on to things you actually like!! :) good luck! :)

[kristakingmath]

no, unfortunately you have to go through the rest of those steps and apply chain rule by working from the outside in. you bring the 2 down in front, but you have to take the derivative of cos, so you get -2sin7x. but then chain rule tells you that you still have to multiply by 7, the derivative of 7x.

[oberonkhan]

got midterm after spring break, your videos are helping greatly :p

[kristakingmath]

Thanks for subscribing! :) As for the intro video on my new series.... I assume you are referring to the bad audio? I was just using a bad mic which clearly didn't work very well. :/

[kristakingmath]

@JaysonD9903 You're welcome! Glad to help :)

[kristakingmath]

ah.... now understand. :) I was just messing around and trying different things at that time. I didn't continue with the intro part bc I didn't think it added any value.

[flawns]

There is no secret in math just practice practice practice practice :) I was so confused with chain rule, but with your video tut + practice = ooh yeah, I got this

[manuellee]

Krista, but if you changed the square of 2 to the outside, wouldn't that be a completely different term? Cause if you have 7*7 that would be 14, so I got stuck on this one. I'll try to read it in the notes, but I'm still confused as to that displacement of the Square.

[kristakingmath]

@freedomvader345 Awesome! Glad I could help. :)

[kennypham]

why did you take the derivative of (1+cos^(2)7x)? Don't you just bring the 2 down, so it would be (1+(2 cos 7x))?

[MrFrankthetank]

You make the chain rule look easy peasy lemon squeezie!

[barin]

I just recently suscribed...what happened to the intro vid on your newer videos

[mitulbaishya]

waw, I like it. u r a excellent teacher. what is ur secret of teaching ?

[kristakingmath]

mmm...I'm not sure I have a secret, I just do my best at trying to simplify the problem. :)

[barin]

Oh. I was just curious. I thought it was a good start to a video.

[barin]

No i was talking about the intro music.lol