Solving a cubic equation using fsolve

2011 3 1
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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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回答（1 个）

Walter Roberson
Walter Roberson 2011-3-1

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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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