x(11-x)=80

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Solution for x(11-x)=80 equation:


Simplifying
x(11 + -1x) = 80
(11 * x + -1x * x) = 80
(11x + -1x2) = 80

Solving
11x + -1x2 = 80

Solving for variable 'x'.

Reorder the terms:
-80 + 11x + -1x2 = 80 + -80

Combine like terms: 80 + -80 = 0
-80 + 11x + -1x2 = 0

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

Divide each side by '-1'.
80 + -11x + x2 = 0

Move the constant term to the right:

Add '-80' to each side of the equation.
80 + -11x + -80 + x2 = 0 + -80

Reorder the terms:
80 + -80 + -11x + x2 = 0 + -80

Combine like terms: 80 + -80 = 0
0 + -11x + x2 = 0 + -80
-11x + x2 = 0 + -80

Combine like terms: 0 + -80 = -80
-11x + x2 = -80

The x term is -11x.  Take half its coefficient (-5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
-11x + 30.25 + x2 = -80 + 30.25

Reorder the terms:
30.25 + -11x + x2 = -80 + 30.25

Combine like terms: -80 + 30.25 = -49.75
30.25 + -11x + x2 = -49.75

Factor a perfect square on the left side:
(x + -5.5)(x + -5.5) = -49.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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