#### krassi_holmz wrote:

Yes, I can, but it's ugly:

a=bx^3+cx^2

Hi krassi_holmz,

THANK YOU VERY, VERY MUCH for this transformation!!

I tried the formula immediately. But unfortunately it does not work for my a, b and c; excel does not calculate square roots from negative values!

My values are:

0,0448036323381 < a < 12,132000000000

b = 0,2135347303000

c = 1,7159763313610

applied to your result of a=bx³+cx² shown above.

I am helpless again.

Do you know if there is a solution to this problem??

Thanks again in advance!