Finding roots of symbolic expression

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Aleem Andrew
Aleem Andrew 2021-11-3
回答： Walter Roberson 2021-11-3
You cannot directly use the roots function to find the roots of a symbolic expression.
syms x
fx = x^2 + 2*x + 1
How do you find the roots of fx other than by typing the coefficients in an array?

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Walter Roberson
Walter Roberson 2021-11-3
Ran in:
syms x
fx = x^2 + 2*x + 1
fx = 
p = sym2poly(fx)
p = 1×3
1 2 1
roots(double(p))
ans = 2×1
-1 -1

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