-(x*x)+20x-660=0

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Solution for -(x*x)+20x-660=0 equation:


Simplifying
-1(x * x) + 20x + -660 = 0

Multiply x * x
-1(x2) + 20x + -660 = 0

Reorder the terms:
-660 + 20x + -1x2 = 0

Solving
-660 + 20x + -1x2 = 0

Solving for variable 'x'.

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

Divide each side by '-1'.
660 + -20x + x2 = 0

Move the constant term to the right:

Add '-660' to each side of the equation.
660 + -20x + -660 + x2 = 0 + -660

Reorder the terms:
660 + -660 + -20x + x2 = 0 + -660

Combine like terms: 660 + -660 = 0
0 + -20x + x2 = 0 + -660
-20x + x2 = 0 + -660

Combine like terms: 0 + -660 = -660
-20x + x2 = -660

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 = -660 + 100

Reorder the terms:
100 + -20x + x2 = -660 + 100

Combine like terms: -660 + 100 = -560
100 + -20x + x2 = -560

Factor a perfect square on the left side:
(x + -10)(x + -10) = -560

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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