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Simplifying
x2 + -0.81 = 0
Reorder the terms:
-0.81 + x2 = 0
Solving
-0.81 + x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '0.81' to each side of the equation.
-0.81 + 0.81 + x2 = 0 + 0.81
Combine like terms: -0.81 + 0.81 = 0.00
0.00 + x2 = 0 + 0.81
x2 = 0 + 0.81
Combine like terms: 0 + 0.81 = 0.81
x2 = 0.81
Simplifying
x2 = 0.81
Take the square root of each side:
x = {-0.9, 0.9}
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