How can I solve polynomial backward?

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MOHAMED
MOHAMED 2012 年 9 月 24 日
Hi,
I have a polynomial as below:
h = a1*T + a2*T^2 + a3*T^3
I know how to solve it if T and all coefficients (a1, a2, & a3) are given.
But if h and the coefficients are given and it is required to calculate T, what is the formula that could evaluate that??
Any help will be appretiated.
M. Selim

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Walter Roberson
Walter Roberson 2012 年 9 月 24 日
roots([a3, a2, a1, -h])

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