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Anyone any good at Maths?

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AshWebster
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PostPosted: 16:26 - 15 Mar 2018    Post subject: Anyone any good at Maths? Reply with quote

Struggling with some inverse Laplace transforms...

(5s-5) / (s^2 + s - 6)

any ideas how to tackle it?
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rpsmith79
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PostPosted: 16:50 - 15 Mar 2018    Post subject: Reply with quote

One of Arcanes socks should be along shortly to help no doubt

Either that, or ask your teacher/tutor to help out
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vice
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PostPosted: 00:32 - 16 Mar 2018    Post subject: Reply with quote

Iíve had a look, my approach is opening another beer
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Freddyfruitba...
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PostPosted: 01:30 - 16 Mar 2018    Post subject: Reply with quote

42 Wink
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Lord Percy
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PostPosted: 02:42 - 16 Mar 2018    Post subject: Reply with quote

This has tons of examples: http://tutorial.math.lamar.edu/Classes/DE/InverseTransforms.aspx
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Jewlio Rides Again LLB
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PostPosted: 08:08 - 16 Mar 2018    Post subject: Reply with quote

Bodyguard should be ok. He's used to having several digits in him at once.
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fatjames
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PostPosted: 11:11 - 16 Mar 2018    Post subject: Reply with quote

Pasting the equation into google brings back a few results that look relevant.
It's way too complicated for me and not something I've ever seen on numberphile..
https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0ahUKEwj3wtidzPDZAhVFL1AKHeF7DwMQFggpMAA&url=http%3A%2F%2Fwww.math.tamu.edu%2F~mvorobet%2FMath308%2FFall07%2FLecture25.pdf&usg=AOvVaw0ybwXRgpVS0zaxPmby4_3m
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RhynoCZ
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PostPosted: 11:19 - 16 Mar 2018    Post subject: Reply with quote

There you go: https://www.wolframalpha.com/input/?i=(5s-5)+%2F+(s%5E2+%2B+s+-+6)
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fatjames
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PostPosted: 11:38 - 16 Mar 2018    Post subject: Reply with quote

Pasting the equation into google brings back a few results that look relevant.
It's way too complicated for me and not something I've ever seen on numberphile..
https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0ahUKEwj3wtidzPDZAhVFL1AKHeF7DwMQFggpMAA&url=http%3A%2F%2Fwww.math.tamu.edu%2F~mvorobet%2FMath308%2FFall07%2FLecture25.pdf&usg=AOvVaw0ybwXRgpVS0zaxPmby4_3m
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King29
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PostPosted: 12:48 - 16 Mar 2018    Post subject: Reply with quote

http://i68.tinypic.com/21enaj8.jpg
http://i63.tinypic.com/1zlyxro.jpg
http://i63.tinypic.com/r8v3hd.jpg
http://i67.tinypic.com/2afctg5.jpg

?
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mpd72
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PostPosted: 13:25 - 16 Mar 2018    Post subject: Reply with quote

https://www.tiger-algebra.com/drill/(5s-5)/(s~2_s-6)/

Includes workings.. Wink
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Lord Percy
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PostPosted: 12:42 - 18 Mar 2018    Post subject: Reply with quote

mpd72 wrote:
https://www.tiger-algebra.com/drill/(5s-5)/(s~2_s-6)/

Includes workings.. Wink



Laughing !

That's not an inverse Laplace transform! Not even close! Laughing
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el_oso
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PostPosted: 23:17 - 18 Mar 2018    Post subject: Reply with quote

factorise your (s^2 + s - 6) and make that your new denominator.

Solve, the partial fraction, using the roots from your factorisation.
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Omega
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PostPosted: 01:30 - 19 Mar 2018    Post subject: Reply with quote

el_oso wrote:
factorise your (s^2 + s - 6) and make that your new denominator.

Solve, the partial fraction, using the roots from your factorisation.


That's what I was going to say...
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AshWebster
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PostPosted: 12:19 - 19 Mar 2018    Post subject: Reply with quote

Ahh it was partial fractions all along!

Managed to figure it out eventually... Thanks for the help

If anyone is curious the final answer was/is:

4e^-3t + e^2t
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Im-a-Ridah
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PostPosted: 20:43 - 21 Mar 2018    Post subject: Re: Anyone any good at Maths? Reply with quote

AshWebster wrote:
Struggling with some inverse Laplace transforms...

(5s-5) / (s^2 + s - 6)

any ideas how to tackle it?


Inverse laplace transforms section of any engineering mathematics book, basically. You'll need to know for your exams anyway tbh.

Inverse laplace transform is kinda useless anyway. It's the s-domain form that is powerful.

What course are you on?
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Chinaboy
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PostPosted: 00:49 - 22 Mar 2018    Post subject: Reply with quote

That's just wrong on so many levels. Confused Math that don't make sense, don't make sense. Wink
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AshWebster
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PostPosted: 12:56 - 22 Mar 2018    Post subject: Re: Anyone any good at Maths? Reply with quote

[quote="Im-a-Ridah"]
AshWebster wrote:


What course are you on?


Aeronautical Engineering HND/year 1 Uni equivalent.
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Im-a-Ridah
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PostPosted: 14:25 - 30 Mar 2018    Post subject: Re: Anyone any good at Maths? Reply with quote

AshWebster wrote:


Aeronautical Engineering HND/year 1 Uni equivalent.


Fair enough. I only really see BEng Y3 and MEng.
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