81c^2-25=

Solution for 81c^2-25= equation:

Simplifying
81c2 + -25 = 0

Reorder the terms:
-25 + 81c2 = 0

Solving
-25 + 81c2 = 0

Solving for variable 'c'.

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

Add '25' to each side of the equation.
-25 + 25 + 81c2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 81c2 = 0 + 25
81c2 = 0 + 25

Combine like terms: 0 + 25 = 25
81c2 = 25

Divide each side by '81'.
c2 = 0.3086419753

Simplifying
c2 = 0.3086419753

Take the square root of each side:
c = {-0.555555556, 0.555555556}