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If you differente $y=2x^2+4$

you get 4x so $\frac{dy}{dx}$ of $y=2x^2+4$

is $4x$ But if you do $\frac{d^2y}{dx^2}$

do you just square the orginial differentation? or do you square $y=2x^2+4$ then differentiate? Please help!

Misaki Mar 8, 2016

edited by Misaki Mar 8, 2016

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Thank you very much!

Misaki Mar 8, 2016

Misaki · Answer 1 · 2016-03-08T12:42:06

Thank you very much!

CPhill · Answer 2 · 2016-03-08T12:41:03

d²y / dx² is the notation for the second derivative .....many times this is written as ... y "....it is the derivative of the first derivative

So

y " of 4x = 4

CPhill · Answer 3 · 2016-03-08T12:45:36

No prob, Misaki !!!!

CPhill · Answer 4 · 2016-03-08T12:48:11

Misaki, I made a slight error in the explanation...I meant to say that :

y" of y = 2x^2 + 4 = 4

Misaki · Answer 5 · 2016-03-08T12:50:26

It's ok i still understood you!