>>>>> "Richard" == Richard Hennessy <rich.hennessy at verizon.net> writes:
Richard> This challenge might be interesting to some people. Try to find the
Richard> three real roots to log(x^3-x*78+90)+x. I had a hard time with it.
Because of the three real zeroes of x^3-x*78+90, the log function
makes it difficult. I transformed the equation to
(x^3-x*78+90)*exp(x)=1 and found the roots of that. A plot of the
original function gives a rough idea of where the roots are: near -6,
1, and 8.
Ray