x^2-11x-121=0

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Solution for x^2-11x-121=0 equation:


Simplifying
x2 + -11x + -121 = 0

Reorder the terms:
-121 + -11x + x2 = 0

Solving
-121 + -11x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '121' to each side of the equation.
-121 + -11x + 121 + x2 = 0 + 121

Reorder the terms:
-121 + 121 + -11x + x2 = 0 + 121

Combine like terms: -121 + 121 = 0
0 + -11x + x2 = 0 + 121
-11x + x2 = 0 + 121

Combine like terms: 0 + 121 = 121
-11x + x2 = 121

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 = 121 + 30.25

Reorder the terms:
30.25 + -11x + x2 = 121 + 30.25

Combine like terms: 121 + 30.25 = 151.25
30.25 + -11x + x2 = 151.25

Factor a perfect square on the left side:
(x + -5.5)(x + -5.5) = 151.25

Calculate the square root of the right side: 12.298373876

Break this problem into two subproblems by setting 
(x + -5.5) equal to 12.298373876 and -12.298373876.

Subproblem 1

x + -5.5 = 12.298373876 Simplifying x + -5.5 = 12.298373876 Reorder the terms: -5.5 + x = 12.298373876 Solving -5.5 + x = 12.298373876 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 = 12.298373876 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = 12.298373876 + 5.5 x = 12.298373876 + 5.5 Combine like terms: 12.298373876 + 5.5 = 17.798373876 x = 17.798373876 Simplifying x = 17.798373876

Subproblem 2

x + -5.5 = -12.298373876 Simplifying x + -5.5 = -12.298373876 Reorder the terms: -5.5 + x = -12.298373876 Solving -5.5 + x = -12.298373876 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 = -12.298373876 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = -12.298373876 + 5.5 x = -12.298373876 + 5.5 Combine like terms: -12.298373876 + 5.5 = -6.798373876 x = -6.798373876 Simplifying x = -6.798373876

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.798373876, -6.798373876}

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