How can I solve polynomial backward?

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

Answer 1

[Walter Roberson]

roots([a3, a2, a1, -h])