0=x^2-11x-5

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Solution for 0=x^2-11x-5 equation:


Simplifying
0 = x2 + -11x + -5

Reorder the terms:
0 = -5 + -11x + x2

Solving
0 = -5 + -11x + x2

Solving for variable 'x'.

Combine like terms: 0 + 5 = 5
5 + 11x + -1x2 = -5 + -11x + x2 + 5 + 11x + -1x2

Reorder the terms:
5 + 11x + -1x2 = -5 + 5 + -11x + 11x + x2 + -1x2

Combine like terms: -5 + 5 = 0
5 + 11x + -1x2 = 0 + -11x + 11x + x2 + -1x2
5 + 11x + -1x2 = -11x + 11x + x2 + -1x2

Combine like terms: -11x + 11x = 0
5 + 11x + -1x2 = 0 + x2 + -1x2
5 + 11x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
5 + 11x + -1x2 = 0

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

Divide each side by '-1'.
-5 + -11x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -11x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + -11x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -11x + x2 = 0 + 5
-11x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
-11x + x2 = 5

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 = 5 + 30.25

Reorder the terms:
30.25 + -11x + x2 = 5 + 30.25

Combine like terms: 5 + 30.25 = 35.25
30.25 + -11x + x2 = 35.25

Factor a perfect square on the left side:
(x + -5.5)(x + -5.5) = 35.25

Calculate the square root of the right side: 5.937171044

Break this problem into two subproblems by setting 
(x + -5.5) equal to 5.937171044 and -5.937171044.

Subproblem 1

x + -5.5 = 5.937171044 Simplifying x + -5.5 = 5.937171044 Reorder the terms: -5.5 + x = 5.937171044 Solving -5.5 + x = 5.937171044 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 = 5.937171044 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = 5.937171044 + 5.5 x = 5.937171044 + 5.5 Combine like terms: 5.937171044 + 5.5 = 11.437171044 x = 11.437171044 Simplifying x = 11.437171044

Subproblem 2

x + -5.5 = -5.937171044 Simplifying x + -5.5 = -5.937171044 Reorder the terms: -5.5 + x = -5.937171044 Solving -5.5 + x = -5.937171044 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 = -5.937171044 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = -5.937171044 + 5.5 x = -5.937171044 + 5.5 Combine like terms: -5.937171044 + 5.5 = -0.437171044 x = -0.437171044 Simplifying x = -0.437171044

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.437171044, -0.437171044}

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