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EBotes
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Message 1 of 3
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Solving complicated single variable eqaution

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HP Prime

I used the fsolve function in CAS for the following:

2200=18log((12(67.43y/2y+67.43))/0.1)*sqrt((67.43y/2y+67.43)(0.002))*(67.43y)

it says error the whole time any suggestions?

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Jan_D
Level 6
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Message 2 of 3
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18log(...) and 12(....) and (....)(0.002) are not allowed.

 

12*(....) and (....)*(0.002) are.

 

What do you mean with 18log(...)?

When you mean 18*log(...) it is interpreted as 18*LN(...) and when you mean a log with base 18 you have to write LOG(...,18).

 

Pay attention to the uppercase in this last case, lowercase gives nonsense!

 

When I store your equation in variable g, and solve for variable y, I get:

 

2017-06-01 14.32.10.jpg

 

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Maké
Level 9
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Message 3 of 3
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Hi!, @EBotes:

 

You can use directly ... App Solve.

See, the images ... 

IMG_20170601_104614.jpg

 

IMG_20170601_104658.jpg

 

IMG_20170601_104730.jpg

 

In comparison, with Wolfram Alpha ... http://www.wolframalpha.com/input/?i=2200%3D18log((12(67.43y%2F2y%2B67.43))%2F0.1)*sqrt((67.43y%2F2y...)

IMG_20170601_104516.jpg

 

Note: Assume as ...

1) log(x), is the natural logarithm (LN).

2) y= Variable.

Kind Regards !.
Have a nice day !.
@Maké (Technical Advisor Premium - HP Program Top Contributor).
Provost in HP Spanish Public Forum ... https://h30467.www3.hp.com/
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