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Math...

Creator: Pølsemanden
January 25, 2012 3:13am
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Permalink | Quote | PM | +Rep | Commend by Pølsemanden » January 25, 2012 3:13am | Report
That feeling when the assignment says, thoroughly differentiate x^3 and u assume that u can save 3 lines at the bottom of the paper and that'll be fine.

Oh my goose i hate differentiation.
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Permalink | Quote | PM | +Rep | Commend by jhoijhoi » January 25, 2012 4:03am | Report
Do you understand how to do it?

It's really easy once you know how.

dy/dx x^3

Take the 3 to the left.

= 3x^_____

Now do the sum "3-1" because you've taken away one 3 from the power.

= 3x^(3-1)

= 3x^2




More examples:

dy/dx 4x^2
= 2*4x^(2-1)
= 8x

Why? Take the 2 from the right, move it to the left and times it by the 4. 2-1 = 1. ie 8x^1 = 8x.

dy/dx 2x^3
= 3*2x^(3-1)
= 6x^2

Why? Take 3 from the right, move it to the left and times it by the 2. 3-1 = 2.




Make sense? :/
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Permalink | Quote | PM | +Rep | Commend by Pølsemanden » January 25, 2012 4:32am | Report
ohh yeah... that's easy...
I do know that... the assignment was about differentialkvotienten(is the danish word for it.)

/|=delta
X^3
/|X=f(x+/|X)-x
/|Y=/|X

Then it comes to step to with reduction which takes a hell-load of time >.<
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Permalink | Quote | PM | +Rep | Commend by PotatisFarfar » January 25, 2012 4:45am | Report
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Permalink | Quote | PM | +Rep | Commend by jhoijhoi » January 25, 2012 4:47am | Report
Ew. Why make it more complicated than it is? I remember having to learn that.

And then at the end of the year they were like, "BTW YOU CAN DO A SHORT CUT LIKE THIS" and I was like "OMG WHY THE HELL DID YOU MAKE US DO IT THE LONG WAY IF I COULD JUST DO IT IN MY HEAD THIS WAY!?!"
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