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Simplifying
81 + -1x2 = 36
Solving
81 + -1x2 = 36
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-81' to each side of the equation.
81 + -81 + -1x2 = 36 + -81
Combine like terms: 81 + -81 = 0
0 + -1x2 = 36 + -81
-1x2 = 36 + -81
Combine like terms: 36 + -81 = -45
-1x2 = -45
Divide each side by '-1'.
x2 = 45
Simplifying
x2 = 45
Take the square root of each side:
x = {-6.708203933, 6.708203933}
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