x^2-2x-12=6

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Solution for x^2-2x-12=6 equation:


Simplifying
x2 + -2x + -12 = 6

Reorder the terms:
-12 + -2x + x2 = 6

Solving
-12 + -2x + x2 = 6

Solving for variable 'x'.

Reorder the terms:
-12 + -6 + -2x + x2 = 6 + -6

Combine like terms: -12 + -6 = -18
-18 + -2x + x2 = 6 + -6

Combine like terms: 6 + -6 = 0
-18 + -2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + -2x + 18 + x2 = 0 + 18

Reorder the terms:
-18 + 18 + -2x + x2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + -2x + x2 = 0 + 18
-2x + x2 = 0 + 18

Combine like terms: 0 + 18 = 18
-2x + x2 = 18

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 18 + 1

Reorder the terms:
1 + -2x + x2 = 18 + 1

Combine like terms: 18 + 1 = 19
1 + -2x + x2 = 19

Factor a perfect square on the left side:
(x + -1)(x + -1) = 19

Calculate the square root of the right side: 4.358898944

Break this problem into two subproblems by setting 
(x + -1) equal to 4.358898944 and -4.358898944.

Subproblem 1

x + -1 = 4.358898944 Simplifying x + -1 = 4.358898944 Reorder the terms: -1 + x = 4.358898944 Solving -1 + x = 4.358898944 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 4.358898944 + 1 Combine like terms: -1 + 1 = 0 0 + x = 4.358898944 + 1 x = 4.358898944 + 1 Combine like terms: 4.358898944 + 1 = 5.358898944 x = 5.358898944 Simplifying x = 5.358898944

Subproblem 2

x + -1 = -4.358898944 Simplifying x + -1 = -4.358898944 Reorder the terms: -1 + x = -4.358898944 Solving -1 + x = -4.358898944 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -4.358898944 + 1 Combine like terms: -1 + 1 = 0 0 + x = -4.358898944 + 1 x = -4.358898944 + 1 Combine like terms: -4.358898944 + 1 = -3.358898944 x = -3.358898944 Simplifying x = -3.358898944

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.358898944, -3.358898944}

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