2d^2-81=0

Solution for 2d^2-81=0 equation:

Simplifying
2d2 + -81 = 0

Reorder the terms:
-81 + 2d2 = 0

Solving
-81 + 2d2 = 0

Solving for variable 'd'.

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

Add '81' to each side of the equation.
-81 + 81 + 2d2 = 0 + 81

Combine like terms: -81 + 81 = 0
0 + 2d2 = 0 + 81
2d2 = 0 + 81

Combine like terms: 0 + 81 = 81
2d2 = 81

Divide each side by '2'.
d2 = 40.5

Simplifying
d2 = 40.5

Take the square root of each side:
d = {-6.363961031, 6.363961031}