Question 915384
"I" is a variable, but not a formula.  You can SOLVE for "I" and then you HAVE A FORMULA for "I".


The method is exactly like explained here:
<a href="http://www.algebra.com/my/Completing-the-Square-to-Solve-General-Quadratic-Equation.lesson?content_action=show_dev">http://www.algebra.com/my/Completing-the-Square-to-Solve-General-Quadratic-Equation.lesson?content_action=show_dev</a>
http://www.algebra.com/my/Completing-the-Square-to-Solve-General-Quadratic-Equation.lesson?content_action=show_dev


{{{I=(-V+- sqrt(V^2-4*(-P)))/(2a)}}}


{{{highlight(I=(-V+- sqrt(V^2+4P))/(2a))}}}