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Simplifying
3x = x2 + 3x + -18
Reorder the terms:
3x = -18 + 3x + x2
Add '-3x' to each side of the equation.
3x + -3x = -18 + 3x + -3x + x2
Combine like terms: 3x + -3x = 0
0 = -18 + 3x + -3x + x2
Combine like terms: 3x + -3x = 0
0 = -18 + 0 + x2
0 = -18 + x2
Solving
0 = -18 + 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 = -18 + x2 + -1x2
Remove the zero:
-1x2 = -18 + x2 + -1x2
Combine like terms: x2 + -1x2 = 0
-1x2 = -18 + 0
-1x2 = -18
Divide each side by '-1'.
x2 = 18
Simplifying
x2 = 18
Take the square root of each side:
x = {-4.242640687, 4.242640687}
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