# 3.120 FAQ-694 How can I calculate the parameter value in a complex equation?

Last Update: 7/28/2018

To calculate the parameter $q$ in a complex equation $K=f(q)$, you can first translate the equation into this form

$Y=f(q)-K$,

and then calculate the $q$ value when $Y=0$. You must have some thoughts of the area in which $q$ locates, from $a$ to $b$ for example. Use the Set Values tool to calculate Y values when $a\leq q \leq b$. Then use levelcrossing or Intersect gadget to find the the exact $q$ value that makes $Y=0$.

Keywords:formula, Set Values dialog

Minimum Origin Version Required: 8.6