20x-x^2=494

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Solution for 20x-x^2=494 equation:


Simplifying
20x + -1x2 = 494

Solving
20x + -1x2 = 494

Solving for variable 'x'.

Reorder the terms:
-494 + 20x + -1x2 = 494 + -494

Combine like terms: 494 + -494 = 0
-494 + 20x + -1x2 = 0

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

Divide each side by '-1'.
494 + -20x + x2 = 0

Move the constant term to the right:

Add '-494' to each side of the equation.
494 + -20x + -494 + x2 = 0 + -494

Reorder the terms:
494 + -494 + -20x + x2 = 0 + -494

Combine like terms: 494 + -494 = 0
0 + -20x + x2 = 0 + -494
-20x + x2 = 0 + -494

Combine like terms: 0 + -494 = -494
-20x + x2 = -494

The x term is -20x.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20x + 100 + x2 = -494 + 100

Reorder the terms:
100 + -20x + x2 = -494 + 100

Combine like terms: -494 + 100 = -394
100 + -20x + x2 = -394

Factor a perfect square on the left side:
(x + -10)(x + -10) = -394

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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