Question

E = ic sq, solve for c

Answer 1

if e=1/1! + 1/2! + 1/3! ...
and i = the sqrt(-1)
then C = -(-1)^(3/4) sqrt(e)
or (-1)^(3/4) sqrt(e)
both being complex numbers

Answer 2

Online, c^2 = c squared

Do you mean E = i * c^2 or E = (ic)^2?

If the former, divide both sides by i and get the square root of both sides.

If the latter, E = i^2 * c^2. Divide both sides by i^2 and get the square root of both sides.