anonymous
  • anonymous
Find the average integral?
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
\[y=x^{2} - 1, [0, \sqrt{3}]\]
anonymous
  • anonymous
|dw:1358903907628:dw|
anonymous
  • anonymous
\[\frac{ 1 }{ \sqrt{3} } ∫\left(\begin{matrix}\sqrt{3} \\ 0\end{matrix}\right)\]

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anonymous
  • anonymous
and is it the area of a triangle - area of a triangle?
UnkleRhaukus
  • UnkleRhaukus
\[\frac1{\sqrt3}\int\limits_0^{\sqrt3}(x^2-1)\mathrm dx\]
anonymous
  • anonymous
yea but i have to solve it with NINT :// the answer comes out to be 0 at x=1
anonymous
  • anonymous
UnkleRhaukus
  • UnkleRhaukus
are you sure?
UnkleRhaukus
  • UnkleRhaukus
i got √3-1 ~0.7~ 1
anonymous
  • anonymous
it's in the back of my book lol
UnkleRhaukus
  • UnkleRhaukus
im not sure how x=1 has anything to do with this problem
anonymous
  • anonymous
"At what point(s) in the interval does the function assume its average value?"
anonymous
  • anonymous
@zepdrix ?? :((
zepdrix
  • zepdrix
What's the ummm average of integral formula? I always forget that thing...\[\large f_{ave}=\frac{1}{b-a}\int\limits_a^b f(x) dx\]I think it's that thing right? So if we apply that to our problem,\[\large f_{ave}=\frac{1}{\sqrt3-0}\int\limits_0^{\sqrt3} x^2-1 \;dx\]Which gives us,\[\large \frac{1}{\sqrt3}\left[\frac{1}{3}x^3-x\right]_0^{\sqrt3} \qquad = \qquad 0\] Does it have something to do with that maybe? So the average of our integral occurs when f(x)=0... Am I interpreting that correctly?? So we have \(f(x)=0 \quad \text{when} \quad x=1\). I dunno... This is a bit of a confusing problem. That's my guess at least.
UnkleRhaukus
  • UnkleRhaukus
ah the answer makes sense now you have stated the question @swin2013

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