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Offline oscampo  
#1 Posted : 17 April 2010 02:34:53(UTC)
oscampo


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Colombia
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Hi,
I'm trying to solve:
S:=157.34
b:=-0.34
N=10^6
aa:=solve(S=A*N^b,A,16000,17000)

Then, SMath give me this message: "No real roots". I found ("by hand"Wink that the answer is A=1.69*10^4. So, what is the problem with SMath?

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Offline omorr  
#2 Posted : 17 April 2010 03:13:58(UTC)
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Hello oscampo,

It seems you are wrong. This is not a nonlinear equation on A, therefore:
A←S/{N^b}
A=17251,9879
If you still want to use "solve", the problem is of the numerical nature and you have to plot the function and use the range as small as possible arround the solution.
Try this:
solve(S≡A*N^b;A;17200;17300)=17251,9879

Regards,
Radovan

Edited by user 17 April 2010 03:15:47(UTC)  | Reason: Not specified

When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!"
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