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Simplifying
-2x = x2 + -2x + -9
Reorder the terms:
-2x = -9 + -2x + x2
Add '2x' to each side of the equation.
-2x + 2x = -9 + -2x + 2x + x2
Combine like terms: -2x + 2x = 0
0 = -9 + -2x + 2x + x2
Combine like terms: -2x + 2x = 0
0 = -9 + 0 + x2
0 = -9 + x2
Solving
0 = -9 + x2
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 = -9 + x2 + -1x2
Remove the zero:
-1x2 = -9 + x2 + -1x2
Combine like terms: x2 + -1x2 = 0
-1x2 = -9 + 0
-1x2 = -9
Divide each side by '-1'.
x2 = 9
Simplifying
x2 = 9
Take the square root of each side:
x = {-3, 3}
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