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Oct 26, 2017
11:21 PM

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Oct 26, 2017
11:21 PM

Given-Find: Undefined Variable

Hello, I am working on some Laplace Transform problems and the problem got messy quickly and I figured I would just use a given find to solve for A, B, C, and D(for the partial fraction). But I am unfortunately running into an issue that I have seen before but I cannot remember how I resolved it. The reoccuring issue is the last variable in the matrix will appear to be undefined when it is clearly defined beforehand. I want to make sure to write down how to properly use the given find so this issue will not occur again. Any help would be greatly appreciated.

8 REPLIES 8

Oct 27, 2017
05:19 AM

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Oct 27, 2017
05:19 AM

**1**. Please attach your worksheet in zip archive to the message.

**2**. Mathcad forum: https://community.ptc.com/t5/PTC-Mathcad-Questions/bd-p/PTCMathcad

Oct 27, 2017
10:03 AM

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Oct 27, 2017
10:03 AM

I am illiterate when its comes to zipping files, but I think I may have done it correctly.

Oct 27, 2017
11:10 AM

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Oct 27, 2017
11:10 AM

You can use the "**Minerr**" function instead of "**Find**" (which tries to find an exact solution).

Oct 27, 2017
04:58 PM

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Oct 27, 2017
04:58 PM

Okay but how is A=1.47, when underneath given I clearly defined

12A=30 with the Boolean equal sign

12A=30 with the Boolean equal sign

Oct 28, 2017
01:43 PM

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Oct 28, 2017
11:54 PM

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Oct 28, 2017
11:54 PM

Thank you very much, like I said this was an annoying partial fraction problem I must have made a math error at some point or the solutions manual is incorrect. Which that isn't the first occasion, anyways thank you for help.

Oct 30, 2017
07:59 AM

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Oct 30, 2017
07:59 AM

I pointed to this solution earlier.

Oct 30, 2017
04:27 PM

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Oct 30, 2017
04:27 PM

Yes, you did.