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find-L-e-x-a-a-with-a-0-and-L-laplace-transfom-




Question Number 38728 by maxmathsup by imad last updated on 28/Jun/18
find L ( (e^(−(x/a)) /a))  with a≠0  and L laplace transfom.
findL(exaa)witha0andLlaplacetransfom.
Commented by abdo mathsup 649 cc last updated on 29/Jun/18
L((1/a) e^(−(x/a)) )= ∫_0 ^∞   (1/a)e^(−(t/a))  e^(−xt) dt  =(1/a)∫_0 ^∞    e^((−x−(1/a))t) dt  =(1/a)  [ (1/(−x−(1/a))) e^((−x−(1/a))t) ]_0 ^(+∞)   =(1/a) (1/(x +(1/a))) = (1/(ax+1)) .
L(1aexa)=01aetaextdt=1a0e(x1a)tdt=1a[1x1ae(x1a)t]0+=1a1x+1a=1ax+1.

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