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Simplifying
0 = 1x2 + -81
Reorder the terms:
0 = -81 + 1x2
Solving
0 = -81 + 1x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-1x2' to each side of the equation.
0 + -1x2 = -81 + 1x2 + -1x2
Remove the zero:
-1x2 = -81 + 1x2 + -1x2
Combine like terms: 1x2 + -1x2 = 0
-1x2 = -81 + 0
-1x2 = -81
Divide each side by '-1'.
x2 = 81
Simplifying
x2 = 81
Take the square root of each side:
x = {-9, 9}
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