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March 29, 2024, 02:14:58 am

Author Topic: Solving for unknown terminal of an integral on TI-89  (Read 1877 times)  Share 

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#1procrastinator

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Solving for unknown terminal of an integral on TI-89
« on: June 27, 2012, 04:13:44 pm »
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e.g. given this



what would I need to input to get it to find k?

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Re: Solving for unknown terminal of an integral on TI-89
« Reply #1 on: June 27, 2012, 04:43:54 pm »
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Find the anti-derivative and sub the k and 2 in, let it equal the RHS, solve for k (you'll get a quadratic).
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#1procrastinator

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Re: Solving for unknown terminal of an integral on TI-89
« Reply #2 on: June 27, 2012, 05:25:26 pm »
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So you can't just somehow plug everything into a calculator and let it do all the work? We solved it in class by hand (same as what you said) then when my teacher said to use our calculators to solve it, I thought he meant let the calculator do everything in one step

HenryP

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Re: Solving for unknown terminal of an integral on TI-89
« Reply #3 on: June 27, 2012, 05:29:37 pm »
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So you can't just somehow plug everything into a calculator and let it do all the work? We solved it in class by hand (same as what you said) then when my teacher said to use our calculators to solve it, I thought he meant let the calculator do everything in one step
Don't know about TI but on the CAS you just highlight that and click solve to get the answer. Is the a similar solve function on the TI?
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b^3

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Re: Solving for unknown terminal of an integral on TI-89
« Reply #4 on: June 27, 2012, 05:39:52 pm »
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OH, whooopps, sorry, didn't read the title correctly, missed the TI-89. My mistake.
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Phy124

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Re: Solving for unknown terminal of an integral on TI-89
« Reply #5 on: June 27, 2012, 05:46:37 pm »
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e.g. given this



what would I need to input to get it to find k?
F2 -> 1: Solve


F3 -> 2: Integrate


Then type the rest in to end up with;



*Note: This is from memory, but I'm pretty sure that's right.
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#1procrastinator

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Re: Solving for unknown terminal of an integral on TI-89
« Reply #6 on: June 27, 2012, 05:55:13 pm »
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^ That's what I've been doing but it just keeps returning with what I plugged in, i.e. just displays the equation that you input

Phy124

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Re: Solving for unknown terminal of an integral on TI-89
« Reply #7 on: June 27, 2012, 06:09:38 pm »
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Well I'm not sure why it's doing that because I'm almost certain that's the correct input  :-\ Try altering some settings or pressing the diamond before enter.

You could also try doing it in two steps;

- Integrate the equation

- Then type
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abeybaby

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Re: Solving for unknown terminal of an integral on TI-89
« Reply #8 on: June 27, 2012, 08:21:49 pm »
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solve(∫(3x+4,x,2,k)=43.5,k)


that gives you k=-23/3 or 5, if you dont get that on your calc then you might have k or x stored as something else, in which case you'd press F1, left, then enter twice

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#1procrastinator

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Re: Solving for unknown terminal of an integral on TI-89
« Reply #9 on: July 06, 2012, 09:13:01 am »
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Sorry for the late reply - I'll try the suggestions, thanks