Boundaries Change With U-Sub? Huh?

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SUMMARY

The discussion centers on the change of integration boundaries when performing a substitution in calculus, specifically using the substitution \( u = 1 + 4t^2 \). The original boundaries of integration from \( t = 0 \) to \( t = 2 \) change to \( u = 1 \) to \( u = 17 \) after applying the substitution. The theorem in question is the Fundamental Theorem of Calculus, which states that when substituting variables in integrals, the limits must also be transformed according to the substitution function.

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TranscendArcu
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So, I've been trying to figure out why the boundaries change in the example below. It seems like the boundaries change from [0,2] to [1,17] and I can't discover why this is. Ideas?

http://img841.imageshack.us/img841/3808/skjermbilde20111129kl52.png
 
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You're just making a substitution. What is the theorem that says that you can calculate integrals by substitution?? What does it say about the bounds?
 
I don't know what theorem this is. What theorem is it?
 
If u = 1+4t2, what u values correspond to your t value limits?
 
Oh! I understand this now: 4t2 + 1, where t=2,0 gives 17 and 1, respectively.

Okay. But, just out of curiosity, what theorem is this? I still don't know.
 

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