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November 08, 2025, 02:05:43 pm
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Author Topic: CAS calc help  (Read 1351 times)  Share 

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lacoste

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CAS calc help
« on: June 14, 2009, 12:53:43 pm »
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i can not solve this using the solve function and it comes out as false all the time.

the equation i want to solve is: (7x/root(x^2+25)) -16 = 0

to find the minimum pts for calculus.


any help appreciated!

thanks
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hyperblade01

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Re: CAS calc help
« Reply #1 on: June 14, 2009, 01:28:41 pm »
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Is that equation the original or the equation of the derivative?

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lacoste

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Re: CAS calc help
« Reply #2 on: June 14, 2009, 06:18:03 pm »
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derivative, trying to find the min pt

i want to make the derivative equal to zero on the solve function and then get x
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hyperblade01

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Re: CAS calc help
« Reply #3 on: June 14, 2009, 06:39:46 pm »
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Not possible as you can't square root a negative, there's no stationary point? So then there isn't a minimum
« Last Edit: June 14, 2009, 06:43:40 pm by hyperblade01 »
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Over9000

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Re: CAS calc help
« Reply #4 on: June 14, 2009, 06:56:51 pm »
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wrong statement, you can not square root a negative over R.
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GerrySly

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Re: CAS calc help
« Reply #5 on: June 14, 2009, 07:03:26 pm »
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Quote from: Over9000 on June 14, 2009, 06:56:51 pm
wrong statement, you can not square root a negative over R.
You can't square root a negative number in maths methods :P
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Mao

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Re: CAS calc help
« Reply #6 on: June 15, 2009, 09:59:35 am »
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Quote from: Over9000 on June 14, 2009, 06:56:51 pm
wrong statement, you can not square root a negative over R.

or N, Z, Q and various other sets :)
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