81e^2-40=0

Solution for 81e^2-40=0 equation:

Simplifying
81e2 + -40 = 0

Reorder the terms:
-40 + 81e2 = 0

Solving
-40 + 81e2 = 0

Solving for variable 'e'.

Move all terms containing e to the left, all other terms to the right.

Add '40' to each side of the equation.
-40 + 40 + 81e2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + 81e2 = 0 + 40
81e2 = 0 + 40

Combine like terms: 0 + 40 = 40
81e2 = 40

Divide each side by '81'.
e2 = 0.4938271605

Simplifying
e2 = 0.4938271605

Take the square root of each side:
e = {-0.702728369, 0.702728369}