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Simplifying
81d2 + -4 = 0
Reorder the terms:
-4 + 81d2 = 0
Solving
-4 + 81d2 = 0
Solving for variable 'd'.
Move all terms containing d to the left, all other terms to the right.
Add '4' to each side of the equation.
-4 + 4 + 81d2 = 0 + 4
Combine like terms: -4 + 4 = 0
0 + 81d2 = 0 + 4
81d2 = 0 + 4
Combine like terms: 0 + 4 = 4
81d2 = 4
Divide each side by '81'.
d2 = 0.04938271605
Simplifying
d2 = 0.04938271605
Take the square root of each side:
d = {-0.222222222, 0.222222222}
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