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Simplifying
0 = 9x2 + -81
Reorder the terms:
0 = -81 + 9x2
Solving
0 = -81 + 9x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-9x2' to each side of the equation.
0 + -9x2 = -81 + 9x2 + -9x2
Remove the zero:
-9x2 = -81 + 9x2 + -9x2
Combine like terms: 9x2 + -9x2 = 0
-9x2 = -81 + 0
-9x2 = -81
Divide each side by '-9'.
x2 = 9
Simplifying
x2 = 9
Take the square root of each side:
x = {-3, 3}
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