How can I rearrange an equation with only one variable?
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How can I rearrange an equation like x^3+2*x^2+3*x-2=0 to a form set equal to an order of x such as x=(1/3)*(-x^3-2*x^2+2) in MATLAB?
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Answers (2)
Bish Erbas
on 27 Sep 2018
Something like this?
syms x
eqn = (x^3+2*x^2+3*x-2 == 0);
pretty(isolate(eqn,3*x)/3)
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Star Strider
on 27 Sep 2018
Perhaps:
syms x
Eq = x^3+2*x^2+3*x-2;
[Cfs,Trm] = coeffs(Eq,x)
Cfs =
[ 1, 2, 3, -2]
Trm =
[ x^3, x^2, x, 1]
Walter Roberson
on 27 Sep 2018
Use coeffs() with the two-output form, probably with the 'all' option. Variable to take it with respect to can be found by symvar(). Check the entry corresponding to the variable to power 1, which will be the second-last entry of the 'all' output.
Now subtract the term (coefficient times x) from the original equation, take the negative, and divide by the coefficient of x.
You will need to decide how you want to proceed if the coefficient associated with variable^1 is 0.
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