how would i type in my fraction in the polynomial to find my real and complex roots

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adriana resendez
adriana resendez 2015-3-6
回答： Star Strider 2015-3-6
fx = x^5-((x^4)/2)-2x^3-x^2-3
roots = fx

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Star Strider
Star Strider 2015-3-6
I expanded your function in the Symbolic Math Toolbox, and got the coefficient vector:
cfx = [1 -0.5 -2 -1 0 -3];
fxroots = roots(cfx)
produces:
fxroots =
1.9710e+000 + i
-1.1131e+000 +654.8187e-003i
-1.1131e+000 -654.8187e-003i
377.6052e-003 +877.5463e-003i
377.6052e-003 -877.5463e-003i
Note that the first root is real. It should be simply 1.9710, but since the others are complex, it is listed with a complex part for consistency. You could do all of this in the Symbolic Math Toolbox of course, but since you didn’t mention that you have access to it, I do not assume you do.

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