-x^2+12x+11=0

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Solution for -x^2+12x+11=0 equation:


Simplifying
-1x2 + 12x + 11 = 0

Reorder the terms:
11 + 12x + -1x2 = 0

Solving
11 + 12x + -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'.
-11 + -12x + x2 = 0

Move the constant term to the right:

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

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

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

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

The x term is -12x.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12x + 36 + x2 = 11 + 36

Reorder the terms:
36 + -12x + x2 = 11 + 36

Combine like terms: 11 + 36 = 47
36 + -12x + x2 = 47

Factor a perfect square on the left side:
(x + -6)(x + -6) = 47

Calculate the square root of the right side: 6.8556546

Break this problem into two subproblems by setting 
(x + -6) equal to 6.8556546 and -6.8556546.

Subproblem 1

x + -6 = 6.8556546 Simplifying x + -6 = 6.8556546 Reorder the terms: -6 + x = 6.8556546 Solving -6 + x = 6.8556546 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = 6.8556546 + 6 Combine like terms: -6 + 6 = 0 0 + x = 6.8556546 + 6 x = 6.8556546 + 6 Combine like terms: 6.8556546 + 6 = 12.8556546 x = 12.8556546 Simplifying x = 12.8556546

Subproblem 2

x + -6 = -6.8556546 Simplifying x + -6 = -6.8556546 Reorder the terms: -6 + x = -6.8556546 Solving -6 + x = -6.8556546 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = -6.8556546 + 6 Combine like terms: -6 + 6 = 0 0 + x = -6.8556546 + 6 x = -6.8556546 + 6 Combine like terms: -6.8556546 + 6 = -0.8556546 x = -0.8556546 Simplifying x = -0.8556546

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.8556546, -0.8556546}

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