-x^2-6x=-73

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Solution for -x^2-6x=-73 equation:


Simplifying
-1x2 + -6x = -73

Reorder the terms:
-6x + -1x2 = -73

Solving
-6x + -1x2 = -73

Solving for variable 'x'.

Reorder the terms:
73 + -6x + -1x2 = -73 + 73

Combine like terms: -73 + 73 = 0
73 + -6x + -1x2 = 0

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

Divide each side by '-1'.
-73 + 6x + x2 = 0

Move the constant term to the right:

Add '73' to each side of the equation.
-73 + 6x + 73 + x2 = 0 + 73

Reorder the terms:
-73 + 73 + 6x + x2 = 0 + 73

Combine like terms: -73 + 73 = 0
0 + 6x + x2 = 0 + 73
6x + x2 = 0 + 73

Combine like terms: 0 + 73 = 73
6x + x2 = 73

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 = 73 + 9

Reorder the terms:
9 + 6x + x2 = 73 + 9

Combine like terms: 73 + 9 = 82
9 + 6x + x2 = 82

Factor a perfect square on the left side:
(x + 3)(x + 3) = 82

Calculate the square root of the right side: 9.055385138

Break this problem into two subproblems by setting 
(x + 3) equal to 9.055385138 and -9.055385138.

Subproblem 1

x + 3 = 9.055385138 Simplifying x + 3 = 9.055385138 Reorder the terms: 3 + x = 9.055385138 Solving 3 + x = 9.055385138 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 = 9.055385138 + -3 Combine like terms: 3 + -3 = 0 0 + x = 9.055385138 + -3 x = 9.055385138 + -3 Combine like terms: 9.055385138 + -3 = 6.055385138 x = 6.055385138 Simplifying x = 6.055385138

Subproblem 2

x + 3 = -9.055385138 Simplifying x + 3 = -9.055385138 Reorder the terms: 3 + x = -9.055385138 Solving 3 + x = -9.055385138 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 = -9.055385138 + -3 Combine like terms: 3 + -3 = 0 0 + x = -9.055385138 + -3 x = -9.055385138 + -3 Combine like terms: -9.055385138 + -3 = -12.055385138 x = -12.055385138 Simplifying x = -12.055385138

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.055385138, -12.055385138}

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