how solve 1 unknown varible function?

hi, i am new at matlab and i am having troubles with fsolve.

>> fsolve('(2x+4)/(x+2)=5','x') ??? Error using ==> fsolve at 148 FSOLVE only accepts inputs of data type double.

Answer 1

[Oleg Komarov]

fsolve(@(x) (2*x+4)/(x+2)-5,0)

And the equation you propose has no solution because x+2 simplifies away

[denis]

thanks, but whats the syntax for solve a valid equation?

[Oleg Komarov]

As in the example, if you have x = 1, rewrite as:

@(x) x-1

Then:

fsolve(@(x) x-1, X0) for some initial value X0

NOTE: no apostrophes

Answer 2

[Walter Roberson]

If you have the symbolic toolbox, use solve() instead of fsolve()

solve('(2x+4)/(x+2)=5','x')