-x^2-6x=-57

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Solution for -x^2-6x=-57 equation:


Simplifying
-1x2 + -6x = -57

Reorder the terms:
-6x + -1x2 = -57

Solving
-6x + -1x2 = -57

Solving for variable 'x'.

Reorder the terms:
57 + -6x + -1x2 = -57 + 57

Combine like terms: -57 + 57 = 0
57 + -6x + -1x2 = 0

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

Divide each side by '-1'.
-57 + 6x + x2 = 0

Move the constant term to the right:

Add '57' to each side of the equation.
-57 + 6x + 57 + x2 = 0 + 57

Reorder the terms:
-57 + 57 + 6x + x2 = 0 + 57

Combine like terms: -57 + 57 = 0
0 + 6x + x2 = 0 + 57
6x + x2 = 0 + 57

Combine like terms: 0 + 57 = 57
6x + x2 = 57

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 = 57 + 9

Reorder the terms:
9 + 6x + x2 = 57 + 9

Combine like terms: 57 + 9 = 66
9 + 6x + x2 = 66

Factor a perfect square on the left side:
(x + 3)(x + 3) = 66

Calculate the square root of the right side: 8.124038405

Break this problem into two subproblems by setting 
(x + 3) equal to 8.124038405 and -8.124038405.

Subproblem 1

x + 3 = 8.124038405 Simplifying x + 3 = 8.124038405 Reorder the terms: 3 + x = 8.124038405 Solving 3 + x = 8.124038405 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 = 8.124038405 + -3 Combine like terms: 3 + -3 = 0 0 + x = 8.124038405 + -3 x = 8.124038405 + -3 Combine like terms: 8.124038405 + -3 = 5.124038405 x = 5.124038405 Simplifying x = 5.124038405

Subproblem 2

x + 3 = -8.124038405 Simplifying x + 3 = -8.124038405 Reorder the terms: 3 + x = -8.124038405 Solving 3 + x = -8.124038405 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 = -8.124038405 + -3 Combine like terms: 3 + -3 = 0 0 + x = -8.124038405 + -3 x = -8.124038405 + -3 Combine like terms: -8.124038405 + -3 = -11.124038405 x = -11.124038405 Simplifying x = -11.124038405

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.124038405, -11.124038405}

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