x^2-12x=139

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Solution for x^2-12x=139 equation:


Simplifying
x2 + -12x = 139

Reorder the terms:
-12x + x2 = 139

Solving
-12x + x2 = 139

Solving for variable 'x'.

Reorder the terms:
-139 + -12x + x2 = 139 + -139

Combine like terms: 139 + -139 = 0
-139 + -12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '139' to each side of the equation.
-139 + -12x + 139 + x2 = 0 + 139

Reorder the terms:
-139 + 139 + -12x + x2 = 0 + 139

Combine like terms: -139 + 139 = 0
0 + -12x + x2 = 0 + 139
-12x + x2 = 0 + 139

Combine like terms: 0 + 139 = 139
-12x + x2 = 139

The x term is -12x.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12x + 36 + x2 = 139 + 36

Reorder the terms:
36 + -12x + x2 = 139 + 36

Combine like terms: 139 + 36 = 175
36 + -12x + x2 = 175

Factor a perfect square on the left side:
(x + -6)(x + -6) = 175

Calculate the square root of the right side: 13.228756555

Break this problem into two subproblems by setting 
(x + -6) equal to 13.228756555 and -13.228756555.

Subproblem 1

x + -6 = 13.228756555 Simplifying x + -6 = 13.228756555 Reorder the terms: -6 + x = 13.228756555 Solving -6 + x = 13.228756555 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = 13.228756555 + 6 Combine like terms: -6 + 6 = 0 0 + x = 13.228756555 + 6 x = 13.228756555 + 6 Combine like terms: 13.228756555 + 6 = 19.228756555 x = 19.228756555 Simplifying x = 19.228756555

Subproblem 2

x + -6 = -13.228756555 Simplifying x + -6 = -13.228756555 Reorder the terms: -6 + x = -13.228756555 Solving -6 + x = -13.228756555 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = -13.228756555 + 6 Combine like terms: -6 + 6 = 0 0 + x = -13.228756555 + 6 x = -13.228756555 + 6 Combine like terms: -13.228756555 + 6 = -7.228756555 x = -7.228756555 Simplifying x = -7.228756555

Solution

The solution to the problem is based on the solutions from the subproblems. x = {19.228756555, -7.228756555}

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