Numerically solve for x in a polynomial equation

2012 2 21
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更新时间：2013 10 19
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If I have a 3rd order polynomial (y = ax^3 + bx^2 + cx + d) with all the coefficients known, how do I plug in a y number and get out the x number?

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Honglei Chen
Honglei Chen 2012-2-21

1 个投票

Write the polynomial as
a*x^3+b*x^2+c*x+d-y
Then you can use fzero to solve x.
doc fzero

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