-81d^2+64=

Solution for -81d^2+64= equation:

Simplifying
-81d2 + 64 = 0

Reorder the terms:
64 + -81d2 = 0

Solving
64 + -81d2 = 0

Solving for variable 'd'.

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

Add '-64' to each side of the equation.
64 + -64 + -81d2 = 0 + -64

Combine like terms: 64 + -64 = 0
0 + -81d2 = 0 + -64
-81d2 = 0 + -64

Combine like terms: 0 + -64 = -64
-81d2 = -64

Divide each side by '-81'.
d2 = 0.7901234568

Simplifying
d2 = 0.7901234568

Take the square root of each side:
d = {-0.888888889, 0.888888889}