Finding critical points | Using derivatives to analyze functions | AP Calculus AB | Khan Academy

Sal finds the critical points of f(x)=xe^(-2x_). Created by Sal Khan.
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[@ashfernandes7327]

Not gonna lie, but this video just confused the hell out of me.

[@estuardomarroquin5945]

khan academy confuses me more sometimes

[@Zakrok09]

took me literally 1 minute and I immediately understood everything as usual, thx khanacademy!

[@HassaanRaza]

good work!

[@X03N30N]

blessing! Thank You!

[@wejyusif]

Thank you

[@narekkazarian4943]

awesome

[@raymondhgerard]

I think that you are a grate teacher in all the Things you teach it would be nice if i could be in one of your classes when it comes to math, because i half to re take the GED on the computer and the teacher said I should know about formulas so I would to know how does one remember all these things when it comes on a test when it comes to algerbra I would like to know Thank you

[@SAMEER.HR_35]

Thanku

[@kevin_lin]

@2:57 Wouldn't you have to find the derivative of (-4x) following the chain rule?

[@samuelnsibande5815]

I got these values ( -2,0,2 ) , are they correct

[@samuelnsibande5815]

How would you find the critical values for g(x)=x^2-8Inx

[@anjanakumari6008]

When i solved, i got the critical points 0, 2 and -2.

[@benlubeley408]

Why does he talk to me like I'm a sixth-grader learning how to add fractions

[@kaad-ku8jf]

where did the 1 in (1-4x^2) come from

[@reapergod1736]

wish i knew

[@reapergod1736]

My closest guess would probs be is that he factored it

[@anjanakumari6008]

He took e^-2x² common from both terms

[@ties9123]

By factoring, he's filtering the e out so you just get left with 1.

[@ninjapirate123]

omg

[@ninjapirate123]

I hate university, but I love KZbin

[@mrwansabah]

I thought the critical points are when F(x)=0 and when f(0)= y, what about f(0) in this equation?

[@az099028]

morearty your passed ? 😁

[@user-lh3lp3xc9m]

Hlaly_1957 HFC yes I did passed

[@ericgurganus5193]

@@user-lh3lp3xc9m ; But not English, huh?