anonymous
  • anonymous
Evaluate the integral from -infinity to infinity of [(t^2+5t)*dirac(t-2)dt]
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
14
anonymous
  • anonymous
Wiki says that the intergral from -infinity to infinity of f(t)dirac(t-T)dt is equal to f(T). So i guess if you distribute and split up the integral it becomes (2)^2+5(2)=14
anonymous
  • anonymous
What type of couse is this for? Just curious

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anonymous
  • anonymous
Darn, I was going about it all wrong lol.. And it's for a linear algebra/differential equations class
anonymous
  • anonymous
Seems interesting
anonymous
  • anonymous
In my textbook it's talking about how dirac(t) = lim h -> 0 [g(h(t)] and then you plug it into the general equation, but I don't really get the whole limit part
anonymous
  • anonymous
oops, it's supposed to be g sub h of t
anonymous
  • anonymous
What function is g sub h?
anonymous
  • anonymous
oh whoops, I forgot to add that part, it's a heavyside function. g sub h = (1/h)[H(t)-H(t-h)]
anonymous
  • anonymous
The limit part. I guess the dirac function is the derivative of the heavyside
anonymous
  • anonymous
If "dirac" is the DiracDelta function then, \[\int\limits _{-\infty }^{\infty }\left(5 t+t^2\right) \delta (-2+t)dt=14 \] Browse over to WolframAlpha.com and paste in the following: Integrate[(t^2 + 5 t) DiracDelta[-2 + t], {t, -Infinity, Infinity}]
anonymous
  • anonymous
Sorry about the double posting. Using Firefox and it seems to have a hair trigger.

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