2x-x^2=19

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Solution for 2x-x^2=19 equation:


Simplifying
2x + -1x2 = 19

Solving
2x + -1x2 = 19

Solving for variable 'x'.

Reorder the terms:
-19 + 2x + -1x2 = 19 + -19

Combine like terms: 19 + -19 = 0
-19 + 2x + -1x2 = 0

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

Divide each side by '-1'.
19 + -2x + x2 = 0

Move the constant term to the right:

Add '-19' to each side of the equation.
19 + -2x + -19 + x2 = 0 + -19

Reorder the terms:
19 + -19 + -2x + x2 = 0 + -19

Combine like terms: 19 + -19 = 0
0 + -2x + x2 = 0 + -19
-2x + x2 = 0 + -19

Combine like terms: 0 + -19 = -19
-2x + x2 = -19

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = -19 + 1

Reorder the terms:
1 + -2x + x2 = -19 + 1

Combine like terms: -19 + 1 = -18
1 + -2x + x2 = -18

Factor a perfect square on the left side:
(x + -1)(x + -1) = -18

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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