0=x^2-10x-126

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Solution for 0=x^2-10x-126 equation:


Simplifying
0 = x2 + -10x + -126

Reorder the terms:
0 = -126 + -10x + x2

Solving
0 = -126 + -10x + x2

Solving for variable 'x'.

Combine like terms: 0 + 126 = 126
126 + 10x + -1x2 = -126 + -10x + x2 + 126 + 10x + -1x2

Reorder the terms:
126 + 10x + -1x2 = -126 + 126 + -10x + 10x + x2 + -1x2

Combine like terms: -126 + 126 = 0
126 + 10x + -1x2 = 0 + -10x + 10x + x2 + -1x2
126 + 10x + -1x2 = -10x + 10x + x2 + -1x2

Combine like terms: -10x + 10x = 0
126 + 10x + -1x2 = 0 + x2 + -1x2
126 + 10x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
126 + 10x + -1x2 = 0

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

Divide each side by '-1'.
-126 + -10x + x2 = 0

Move the constant term to the right:

Add '126' to each side of the equation.
-126 + -10x + 126 + x2 = 0 + 126

Reorder the terms:
-126 + 126 + -10x + x2 = 0 + 126

Combine like terms: -126 + 126 = 0
0 + -10x + x2 = 0 + 126
-10x + x2 = 0 + 126

Combine like terms: 0 + 126 = 126
-10x + x2 = 126

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = 126 + 25

Reorder the terms:
25 + -10x + x2 = 126 + 25

Combine like terms: 126 + 25 = 151
25 + -10x + x2 = 151

Factor a perfect square on the left side:
(x + -5)(x + -5) = 151

Calculate the square root of the right side: 12.288205727

Break this problem into two subproblems by setting 
(x + -5) equal to 12.288205727 and -12.288205727.

Subproblem 1

x + -5 = 12.288205727 Simplifying x + -5 = 12.288205727 Reorder the terms: -5 + x = 12.288205727 Solving -5 + x = 12.288205727 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 12.288205727 + 5 Combine like terms: -5 + 5 = 0 0 + x = 12.288205727 + 5 x = 12.288205727 + 5 Combine like terms: 12.288205727 + 5 = 17.288205727 x = 17.288205727 Simplifying x = 17.288205727

Subproblem 2

x + -5 = -12.288205727 Simplifying x + -5 = -12.288205727 Reorder the terms: -5 + x = -12.288205727 Solving -5 + x = -12.288205727 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -12.288205727 + 5 Combine like terms: -5 + 5 = 0 0 + x = -12.288205727 + 5 x = -12.288205727 + 5 Combine like terms: -12.288205727 + 5 = -7.288205727 x = -7.288205727 Simplifying x = -7.288205727

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.288205727, -7.288205727}

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