0=x^2-22x-8

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Solution for 0=x^2-22x-8 equation:


Simplifying
0 = x2 + -22x + -8

Reorder the terms:
0 = -8 + -22x + x2

Solving
0 = -8 + -22x + x2

Solving for variable 'x'.

Combine like terms: 0 + 8 = 8
8 + 22x + -1x2 = -8 + -22x + x2 + 8 + 22x + -1x2

Reorder the terms:
8 + 22x + -1x2 = -8 + 8 + -22x + 22x + x2 + -1x2

Combine like terms: -8 + 8 = 0
8 + 22x + -1x2 = 0 + -22x + 22x + x2 + -1x2
8 + 22x + -1x2 = -22x + 22x + x2 + -1x2

Combine like terms: -22x + 22x = 0
8 + 22x + -1x2 = 0 + x2 + -1x2
8 + 22x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
8 + 22x + -1x2 = 0

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

Divide each side by '-1'.
-8 + -22x + x2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -22x + 8 + x2 = 0 + 8

Reorder the terms:
-8 + 8 + -22x + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -22x + x2 = 0 + 8
-22x + x2 = 0 + 8

Combine like terms: 0 + 8 = 8
-22x + x2 = 8

The x term is -22x.  Take half its coefficient (-11).
Square it (121) and add it to both sides.

Add '121' to each side of the equation.
-22x + 121 + x2 = 8 + 121

Reorder the terms:
121 + -22x + x2 = 8 + 121

Combine like terms: 8 + 121 = 129
121 + -22x + x2 = 129

Factor a perfect square on the left side:
(x + -11)(x + -11) = 129

Calculate the square root of the right side: 11.357816692

Break this problem into two subproblems by setting 
(x + -11) equal to 11.357816692 and -11.357816692.

Subproblem 1

x + -11 = 11.357816692 Simplifying x + -11 = 11.357816692 Reorder the terms: -11 + x = 11.357816692 Solving -11 + x = 11.357816692 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + x = 11.357816692 + 11 Combine like terms: -11 + 11 = 0 0 + x = 11.357816692 + 11 x = 11.357816692 + 11 Combine like terms: 11.357816692 + 11 = 22.357816692 x = 22.357816692 Simplifying x = 22.357816692

Subproblem 2

x + -11 = -11.357816692 Simplifying x + -11 = -11.357816692 Reorder the terms: -11 + x = -11.357816692 Solving -11 + x = -11.357816692 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + x = -11.357816692 + 11 Combine like terms: -11 + 11 = 0 0 + x = -11.357816692 + 11 x = -11.357816692 + 11 Combine like terms: -11.357816692 + 11 = -0.357816692 x = -0.357816692 Simplifying x = -0.357816692

Solution

The solution to the problem is based on the solutions from the subproblems. x = {22.357816692, -0.357816692}

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