-x^2=-6x-6

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


Simplifying
-1x2 = -6x + -6

Reorder the terms:
-1x2 = -6 + -6x

Solving
-1x2 = -6 + -6x

Solving for variable 'x'.

Reorder the terms:
6 + 6x + -1x2 = -6 + -6x + 6 + 6x

Reorder the terms:
6 + 6x + -1x2 = -6 + 6 + -6x + 6x

Combine like terms: -6 + 6 = 0
6 + 6x + -1x2 = 0 + -6x + 6x
6 + 6x + -1x2 = -6x + 6x

Combine like terms: -6x + 6x = 0
6 + 6x + -1x2 = 0

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

Divide each side by '-1'.
-6 + -6x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -6x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + -6x + x2 = 0 + 6

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

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

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 6 + 9

Reorder the terms:
9 + -6x + x2 = 6 + 9

Combine like terms: 6 + 9 = 15
9 + -6x + x2 = 15

Factor a perfect square on the left side:
(x + -3)(x + -3) = 15

Calculate the square root of the right side: 3.872983346

Break this problem into two subproblems by setting 
(x + -3) equal to 3.872983346 and -3.872983346.

Subproblem 1

x + -3 = 3.872983346 Simplifying x + -3 = 3.872983346 Reorder the terms: -3 + x = 3.872983346 Solving -3 + x = 3.872983346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 3.872983346 + 3 Combine like terms: -3 + 3 = 0 0 + x = 3.872983346 + 3 x = 3.872983346 + 3 Combine like terms: 3.872983346 + 3 = 6.872983346 x = 6.872983346 Simplifying x = 6.872983346

Subproblem 2

x + -3 = -3.872983346 Simplifying x + -3 = -3.872983346 Reorder the terms: -3 + x = -3.872983346 Solving -3 + x = -3.872983346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -3.872983346 + 3 Combine like terms: -3 + 3 = 0 0 + x = -3.872983346 + 3 x = -3.872983346 + 3 Combine like terms: -3.872983346 + 3 = -0.872983346 x = -0.872983346 Simplifying x = -0.872983346

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.872983346, -0.872983346}

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