Hi, I try the root finding program xqroot. I try to find the two quadratics for x^4 + 1 and x^4 - 1 using the program xqroot from the download C++ 2.11. In both cases a get the wrong answer.

Dear King,

qroots works fine on the examples you gave. However, as explained in the text, you need good initial guesses for the coefficients of the quadratic.

Saul Teukolsky