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Simplifying
81x2 + 8 = 12
Reorder the terms:
8 + 81x2 = 12
Solving
8 + 81x2 = 12
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-8' to each side of the equation.
8 + -8 + 81x2 = 12 + -8
Combine like terms: 8 + -8 = 0
0 + 81x2 = 12 + -8
81x2 = 12 + -8
Combine like terms: 12 + -8 = 4
81x2 = 4
Divide each side by '81'.
x2 = 0.04938271605
Simplifying
x2 = 0.04938271605
Take the square root of each side:
x = {-0.222222222, 0.222222222}
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