2x^2-22x-121=0

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Solution for 2x^2-22x-121=0 equation:


Simplifying
2x2 + -22x + -121 = 0

Reorder the terms:
-121 + -22x + 2x2 = 0

Solving
-121 + -22x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-60.5 + -11x + x2 = 0

Move the constant term to the right:

Add '60.5' to each side of the equation.
-60.5 + -11x + 60.5 + x2 = 0 + 60.5

Reorder the terms:
-60.5 + 60.5 + -11x + x2 = 0 + 60.5

Combine like terms: -60.5 + 60.5 = 0.0
0.0 + -11x + x2 = 0 + 60.5
-11x + x2 = 0 + 60.5

Combine like terms: 0 + 60.5 = 60.5
-11x + x2 = 60.5

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 = 60.5 + 30.25

Reorder the terms:
30.25 + -11x + x2 = 60.5 + 30.25

Combine like terms: 60.5 + 30.25 = 90.75
30.25 + -11x + x2 = 90.75

Factor a perfect square on the left side:
(x + -5.5)(x + -5.5) = 90.75

Calculate the square root of the right side: 9.526279442

Break this problem into two subproblems by setting 
(x + -5.5) equal to 9.526279442 and -9.526279442.

Subproblem 1

x + -5.5 = 9.526279442 Simplifying x + -5.5 = 9.526279442 Reorder the terms: -5.5 + x = 9.526279442 Solving -5.5 + x = 9.526279442 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 = 9.526279442 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = 9.526279442 + 5.5 x = 9.526279442 + 5.5 Combine like terms: 9.526279442 + 5.5 = 15.026279442 x = 15.026279442 Simplifying x = 15.026279442

Subproblem 2

x + -5.5 = -9.526279442 Simplifying x + -5.5 = -9.526279442 Reorder the terms: -5.5 + x = -9.526279442 Solving -5.5 + x = -9.526279442 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 = -9.526279442 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = -9.526279442 + 5.5 x = -9.526279442 + 5.5 Combine like terms: -9.526279442 + 5.5 = -4.026279442 x = -4.026279442 Simplifying x = -4.026279442

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.026279442, -4.026279442}

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