x=x^2-4x-12

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Solution for x=x^2-4x-12 equation:


Simplifying
x = x2 + -4x + -12

Reorder the terms:
x = -12 + -4x + x2

Solving
x = -12 + -4x + x2

Solving for variable 'x'.

Reorder the terms:
12 + x + 4x + -1x2 = -12 + -4x + x2 + 12 + 4x + -1x2

Combine like terms: x + 4x = 5x
12 + 5x + -1x2 = -12 + -4x + x2 + 12 + 4x + -1x2

Reorder the terms:
12 + 5x + -1x2 = -12 + 12 + -4x + 4x + x2 + -1x2

Combine like terms: -12 + 12 = 0
12 + 5x + -1x2 = 0 + -4x + 4x + x2 + -1x2
12 + 5x + -1x2 = -4x + 4x + x2 + -1x2

Combine like terms: -4x + 4x = 0
12 + 5x + -1x2 = 0 + x2 + -1x2
12 + 5x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
12 + 5x + -1x2 = 0

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

Divide each side by '-1'.
-12 + -5x + x2 = 0

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -5x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + -5x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -5x + x2 = 0 + 12
-5x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
-5x + x2 = 12

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 12 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 12 + 6.25

Combine like terms: 12 + 6.25 = 18.25
6.25 + -5x + x2 = 18.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 18.25

Calculate the square root of the right side: 4.272001873

Break this problem into two subproblems by setting 
(x + -2.5) equal to 4.272001873 and -4.272001873.

Subproblem 1

x + -2.5 = 4.272001873 Simplifying x + -2.5 = 4.272001873 Reorder the terms: -2.5 + x = 4.272001873 Solving -2.5 + x = 4.272001873 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 4.272001873 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 4.272001873 + 2.5 x = 4.272001873 + 2.5 Combine like terms: 4.272001873 + 2.5 = 6.772001873 x = 6.772001873 Simplifying x = 6.772001873

Subproblem 2

x + -2.5 = -4.272001873 Simplifying x + -2.5 = -4.272001873 Reorder the terms: -2.5 + x = -4.272001873 Solving -2.5 + x = -4.272001873 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -4.272001873 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -4.272001873 + 2.5 x = -4.272001873 + 2.5 Combine like terms: -4.272001873 + 2.5 = -1.772001873 x = -1.772001873 Simplifying x = -1.772001873

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.772001873, -1.772001873}

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