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Maths problem....


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Right doing intergration by substitution, and there is nout in this big fuck off textbook that I "had" to buy which hasn't even eben used yet, about it.

 

so could anyone tell me how the fuck you intergrate this:

 

dx/(x^0.5 + 1)^0.5  when u = x^0.5+1

 

solid...

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Guest smoggeordie

Differentiate the u=x^0.5+1 bit to get du/dx then rearrange that bit in terms of dx so you can substitute on the top so you will have

 

I'm not telling you/u^0.5

 

Then work out as normal.

 

Don't forget to change your integration limits.

 

(I think, aint done substitution in donkeys :lol:)

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Guest Magnetic North

“so could anyone tell me how the **** you intergrate this:

dx/(x^0.5 + 1)^0.5  when u = x^0.5+1”

 

No problem at all Andy,  if you can tell me about Jacobean vernacular mannerist architecture. You've 10 seconds.

Shoot.

 

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Guest Invicta_Toon

tell you what, lets swap

 

If you can tell me how to do principle component analysis using a Guassian normalised distribution, we might be able to trade... bluelaugh.gif

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(4/3)(x^0.5 + 1)^1.5 - 4(x^0.5 + 1)^0.5 + integrating constant

 

Not meaning to be condascending but I don't see what your problem is.  Where are you having the difficulty?  Get everything within the integral in terms of u and integrate. 

 

Me either. Just something about Intergration by substitution I just can't do, just dont think I was ever taught it properly. I'm going to have a go at it, and I'll see what happens.

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Guest Magnetic North

What I've personally taken from this thread is a reminder that maths/science types struggle with grammar  :winking:

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Right doing intergration by substitution, and there is nout in this big fuck off textbook that I "had" to buy which hasn't even eben used yet, about it.

 

so could anyone tell me how the fuck you intergrate this:

 

dx/(x^0.5 + 1)^0.5  when u = x^0.5+1

 

solid...

 

could have done it years ago, but forgot now. Sorry mate.

 

 

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I got it all sorted now like. Stuck on something else, but its just the wording of the question.

 

M = 4  3

      2  3

 

find  a,b such that M^2+aM+bM=0

 

I've done that bit which seemed pretty straight forward. The next part is

 

Premultiply this equation,with your values of a and b, sympolically by M^-1, assuming it exists, and hence find M^-1 in terms of M and I.

 

What the fuck is that?

 

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I got it all sorted now like. Stuck on something else, but its just the wording of the question.

 

M = 4  3

       2  3

 

find  a,b such that M^2+aM+bM=0

 

I've done that bit which seemed pretty straight forward. The next part is

 

Premultiply this equation,with your values of a and b, sympolically by M^-1, assuming it exists, and hence find M^-1 in terms of M and I.

 

What the **** is that?

 

 

You're going to have to be a bit clearer here.  Are you sure that

 

M^2+aM+bM=0

 

isn't supposed to be

 

M^2+aM+b=0?

 

That would make a lot more sense to me.  Assuming this is the case,

 

M^-1=(1/6)(7I - M).

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