0=x^2-22x-7

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Solution for 0=x^2-22x-7 equation:


Simplifying
0 = x2 + -22x + -7

Reorder the terms:
0 = -7 + -22x + x2

Solving
0 = -7 + -22x + x2

Solving for variable 'x'.

Combine like terms: 0 + 7 = 7
7 + 22x + -1x2 = -7 + -22x + x2 + 7 + 22x + -1x2

Reorder the terms:
7 + 22x + -1x2 = -7 + 7 + -22x + 22x + x2 + -1x2

Combine like terms: -7 + 7 = 0
7 + 22x + -1x2 = 0 + -22x + 22x + x2 + -1x2
7 + 22x + -1x2 = -22x + 22x + x2 + -1x2

Combine like terms: -22x + 22x = 0
7 + 22x + -1x2 = 0 + x2 + -1x2
7 + 22x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
7 + 22x + -1x2 = 0

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

Divide each side by '-1'.
-7 + -22x + x2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -22x + 7 + x2 = 0 + 7

Reorder the terms:
-7 + 7 + -22x + x2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -22x + x2 = 0 + 7
-22x + x2 = 0 + 7

Combine like terms: 0 + 7 = 7
-22x + x2 = 7

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 = 7 + 121

Reorder the terms:
121 + -22x + x2 = 7 + 121

Combine like terms: 7 + 121 = 128
121 + -22x + x2 = 128

Factor a perfect square on the left side:
(x + -11)(x + -11) = 128

Calculate the square root of the right side: 11.313708499

Break this problem into two subproblems by setting 
(x + -11) equal to 11.313708499 and -11.313708499.

Subproblem 1

x + -11 = 11.313708499 Simplifying x + -11 = 11.313708499 Reorder the terms: -11 + x = 11.313708499 Solving -11 + x = 11.313708499 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 = 11.313708499 + 11 Combine like terms: -11 + 11 = 0 0 + x = 11.313708499 + 11 x = 11.313708499 + 11 Combine like terms: 11.313708499 + 11 = 22.313708499 x = 22.313708499 Simplifying x = 22.313708499

Subproblem 2

x + -11 = -11.313708499 Simplifying x + -11 = -11.313708499 Reorder the terms: -11 + x = -11.313708499 Solving -11 + x = -11.313708499 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 = -11.313708499 + 11 Combine like terms: -11 + 11 = 0 0 + x = -11.313708499 + 11 x = -11.313708499 + 11 Combine like terms: -11.313708499 + 11 = -0.313708499 x = -0.313708499 Simplifying x = -0.313708499

Solution

The solution to the problem is based on the solutions from the subproblems. x = {22.313708499, -0.313708499}

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