-x^2+11x=12

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Solution for -x^2+11x=12 equation:


Simplifying
-1x2 + 11x = 12

Reorder the terms:
11x + -1x2 = 12

Solving
11x + -1x2 = 12

Solving for variable 'x'.

Reorder the terms:
-12 + 11x + -1x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-12 + 11x + -1x2 = 0

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

Divide each side by '-1'.
12 + -11x + x2 = 0

Move the constant term to the right:

Add '-12' to each side of the equation.
12 + -11x + -12 + x2 = 0 + -12

Reorder the terms:
12 + -12 + -11x + x2 = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -11x + x2 = 0 + -12
-11x + x2 = 0 + -12

Combine like terms: 0 + -12 = -12
-11x + x2 = -12

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 = -12 + 30.25

Reorder the terms:
30.25 + -11x + x2 = -12 + 30.25

Combine like terms: -12 + 30.25 = 18.25
30.25 + -11x + x2 = 18.25

Factor a perfect square on the left side:
(x + -5.5)(x + -5.5) = 18.25

Calculate the square root of the right side: 4.272001873

Break this problem into two subproblems by setting 
(x + -5.5) equal to 4.272001873 and -4.272001873.

Subproblem 1

x + -5.5 = 4.272001873 Simplifying x + -5.5 = 4.272001873 Reorder the terms: -5.5 + x = 4.272001873 Solving -5.5 + x = 4.272001873 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + x = 4.272001873 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = 4.272001873 + 5.5 x = 4.272001873 + 5.5 Combine like terms: 4.272001873 + 5.5 = 9.772001873 x = 9.772001873 Simplifying x = 9.772001873

Subproblem 2

x + -5.5 = -4.272001873 Simplifying x + -5.5 = -4.272001873 Reorder the terms: -5.5 + x = -4.272001873 Solving -5.5 + x = -4.272001873 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + x = -4.272001873 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = -4.272001873 + 5.5 x = -4.272001873 + 5.5 Combine like terms: -4.272001873 + 5.5 = 1.227998127 x = 1.227998127 Simplifying x = 1.227998127

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.772001873, 1.227998127}

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