I want to transfrom from left hand side to right hand side. What function sholud I use?

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Star Strider
Star Strider am 13 Nov. 2016

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You are factoring a 3-degree polynomial, not analytically easy.
The best I can do is:
syms k1 k2 k3 x real
assume(k1 ~= 0)
assume(k2 ~= 0)
assume(k3 ~= 0)
Eqn = 1 + k1*x + k2*x^2 + k3*x^3;
F1 = solve(Eqn == 0, x, 'MaxDegree',2, 'Real',1);
F1v = vpa(F1,3);
abc = vpa(simplify(F1v, 'steps', 30), 3) % ‘a’, ‘b’, ‘c’ Coefficients
Simplifying the result or attempting to find subexpressions that would make it more tractable are not possible. No worries about the warning, but it is instructive.

4 Kommentare

Deokjae Jeong
Deokjae Jeong am 13 Nov. 2016
Thank you for your answer. I realized that LHS does not always have three real values when expresed LHS==0. I checked your answer and it works. Thank you.
Star Strider
Star Strider am 13 Nov. 2016
My pleasure.
If my Answer solved your problem, please Accept it.
Deokjae Jeong
Deokjae Jeong am 13 Nov. 2016
Oh, my mistake. I accepted it.
Star Strider
Star Strider am 13 Nov. 2016
Thank you!

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