Solving a cubic equation using fsolve

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Akrish Sharma
Akrish Sharma le 1 Mar 2011
Hi I am a beginner in matlab. I was given in problem to solve a cubic equation using fsolve. The equation is: 0.2456*x^3-2.76*x^2+7.92*x+3=0 whenever i try solving this using fsolve i get that the variable x is undefined.i dont know what im doing wrong. pls help me out.hope for a prompt reply.

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Walter Roberson
Walter Roberson le 1 Mar 2011
You need to define your equation as a function:
eqn1 = @(x) 0.2456*x^3-2.76*x^2+7.92*x+3
Then you would fsolve(eqn1, x0) where x0 is the initial guess.
See Example 1 in the fsolve documentation

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