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November 10th, 2017, 02:13 PM   #1
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Question Is it possible that Wolfram Mathematica is solving integrals wrongly?

I think this integral calculation in Mathematica is wrong.
I am quite sure, that Mathematica works ok, while I do not understand something. Please help me.

Graphs (the red one is under the blue and the green):

Wolfram Mathematica

Symbolab:

Last edited by skipjack; November 10th, 2017 at 06:02 PM.
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November 12th, 2017, 02:11 PM   #2
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Why do you think it's wrong? It's a decaying exponential.
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November 13th, 2017, 03:31 PM   #3
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How many decimal places are you allowing for the answer?

$\int_{10.3}^\infty e^{-39.1(x- 10.3}dx$
$-\frac{1}{39.1}\left[e^{-39.1(x- 10.3)}\right]_{10.3}^\infty$

$-\frac{1}{39.1}\left(0- 1\right)= \frac{1}{39.1}= 0.02557$
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