x-x^2=18

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Solution for x-x^2=18 equation:


Simplifying
x + -1x2 = 18

Solving
x + -1x2 = 18

Solving for variable 'x'.

Reorder the terms:
-18 + x + -1x2 = 18 + -18

Combine like terms: 18 + -18 = 0
-18 + x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
18 + -1x + x2 = 0

Move the constant term to the right:

Add '-18' to each side of the equation.
18 + -1x + -18 + x2 = 0 + -18

Reorder the terms:
18 + -18 + -1x + x2 = 0 + -18

Combine like terms: 18 + -18 = 0
0 + -1x + x2 = 0 + -18
-1x + x2 = 0 + -18

Combine like terms: 0 + -18 = -18
-1x + x2 = -18

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = -18 + 0.25

Reorder the terms:
0.25 + -1x + x2 = -18 + 0.25

Combine like terms: -18 + 0.25 = -17.75
0.25 + -1x + x2 = -17.75

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = -17.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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