Question

Solve the formula for the given letter. Assume all variables represent nonnegative numbers. E=kc^2, for c.

it's e/k, I just cant figure out whether it's positive or negative and with or without a sqrt

Answer 1

Assuming you have:
\[E=kc^2\]
Divide each side by k:
\[\frac{E}{k}=\frac{kc^2}{k}\]
\[\frac{E}{k}=c^2\]
Take the square Root on each side:
\[c=\sqrt{\frac{E}{k}}\]