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Differentiating


stopandthink

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You have to FOIL twice, basically.

 

So you do (x+dx) * (x+dx) then multiply the product by (x+dx) again.

 

My question is why are you bothering to do all this work when a simple application of the product rule will get the result you need.

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Yeah, though I would write it like this to avoid confusion

 

[math] (x^2+2dx(x)+dx^2)\times(x+dx) [/math]

 

Could you explain how to use the foil method on this?

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I'm just going to review the binomial theorem. smile.gif

Edited by stopandthink
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Could you explain how to use the foil method on this?

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I'm just going to review the binomial theorem. smile.gif

 

It's not really FOIL at this point. It's just brute force multiplication.

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