[B]Integration ~ Substitution Method HELP???[/B] (1 Viewer)

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MysteryMoon

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I'm just confused as to how it works.
I've been trying to solve this equation: x (2x + 7) , let u = 2x + 7

So this is what I did:

du/dx = 2

du/2 = dx <-- this is where I'm stuck (cuz apparently the right side is meant to be the derivative of 2x + 7 but there's an x in x(2x + 7) so I'm so confused now........

Seriously, I don't even understand myself. =_=

I just don't get the concept of it. Any help would be appreciated.
 
integral95

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MysteryMoon said:
I'm just confused as to how it works.
I've been trying to solve this equation: x (2x + 7) , let u = 2x + 7

So this is what I did:

du/dx = 2

du/2 = dx <-- this is where I'm stuck (cuz apparently the right side is meant to be the derivative of 2x + 7 but there's an x in x(2x + 7) so I'm so confused now........

Seriously, I don't even understand myself. =_=

I just don't get the concept of it. Any help would be appreciated.
Click to expand...
I'm assuming you mean



your step is correct so far,regarding the bolded part it doesn't have to be.

 
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MysteryMoon

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Not sure if srs
Click to expand...
I am serious. =_= Like how would you expand x(2x + 7)^1/2 then? It's expanding with a fractional indice......... (or am I muddling myself up???)
 
Squar3root

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MysteryMoon said:
I am serious. =_= Like how would you expand x(2x + 7)^1/2 then? It's expanding with a fractional indice......... (or am I muddling myself up???)
Click to expand...
Oops didn't see the 1/2

It would be better to let u^2 = 2x+7
 
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