Lagrange Multipliers Example 2 PART 1/2 (KristaKingMath)

Lagrange Multipliers 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?!”

[diaocdallastexas]

at it has to be positive and negative, because we are taking square root?? 
Thanks

[naheelazawy]

@6:15 you should mention that you can divide by x and by y because xy=1 => x and y !=0, otherwise you can't divide.
@8:15 it should be |x|=|y| right?

[Umairshahid]

thanx this helped me alot, u just did it in 10 min what my professor failed to do in 50 min.

[khaxinonyourmom]

Even your old videos are so helpful, thank you :)  This is my second time trying to finish up my math sequence for college, I got hung up at integral calc last time, and your videos give me confidence that I can do it this time!

[i_am_shakaib]

your way of teaching is incredible kindly make videos about computer programming.

[ArunKumar-ybjn]

That way of holding the marker is hurting my hands.

[kristakingmath]

@asifadio Yes! I'm working all the time! What about you? :)

[kristakingmath]

@asifadio I didn't realize how much I loved it! Making up for lost time now though! :D

[kristakingmath]

@DaveAp7 No way!! Actually, this problem was NOT taken from Stewart! Guess we just got lucky!! That's awesome!! :D

[Xclann]

When you took the square root, what about the case in which x is negative?
If x^2 = 1, x = (+/-) sqrt(1) => x = {1, -1}.
How come you can ignore the negative one?

[yarixtech]

square root of the square of x is the absolue value of x

[acommenter]

5:28 - "not plus lambda, just tack it onto the end"

[kristakingmath]

Hahahaha! Hilarious! Made me smile... :) Glad you liked the video. :)

[catman]

at 8:14 shouldn't it be x = y or x = -y?

[minincarnate]

I love the videos so far, but I just want to be a little pedantic here. You really should have said x=+/-y. Eventually it would have given the possible solution of x^2=-1, which is invalid if you want real solutions. Still, I think it should have been in there just for completeness's sake. =)

[Smitaay]

That's funny stuff, because I am on that EXACT same section in that book. hahaha

[scalesconfrey]

VERY FUNNY. So uh, how exactly is she wrong? I watched both videos and she DID solve it correctly.

[Smitaay]

So you are the pretty girl that was still around in Calc III with the 27 other guys. hehe Did you feel like a cookie at a Weight Watcher's convention?

Also, nice vid. =)

[MrTriton]

I can get the how, but no one has explained the why. Number crunching is not the same as doing math. No wonder why math seems too boring.

[otisbaker]

You are the best! Can I take you out on a date?