Unidentified Function error when trying to solve an equation

2013 1 10
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I am simply trying to solve the equation for the variable k and every time I run the program it comes back with an unidentified variable error below is the code and the result
When I copy it into wolframalpha it comes back just fine so I know I didnt type the equation wrong.
Code
solve(2*pi*sqrt((.5*((k^2)+(((4/3)*k)^2))))==100 , k)
Result
Undefined function or variable 'k'.
Error in MitchAndrewsLab1 (line 18) solve('2*pi*sqrt((.5*((k^2)+(((4/3)*k)^2))))==100' , k)

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Sean de Wolski
Sean de Wolski 2013-1-10

0 个投票

You need to define k as symbolic before the expression:
syms k
solve(etc,k)

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