0=x^2-18x-6

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Solution for 0=x^2-18x-6 equation:


Simplifying
0 = x2 + -18x + -6

Reorder the terms:
0 = -6 + -18x + x2

Solving
0 = -6 + -18x + x2

Solving for variable 'x'.

Combine like terms: 0 + 6 = 6
6 + 18x + -1x2 = -6 + -18x + x2 + 6 + 18x + -1x2

Reorder the terms:
6 + 18x + -1x2 = -6 + 6 + -18x + 18x + x2 + -1x2

Combine like terms: -6 + 6 = 0
6 + 18x + -1x2 = 0 + -18x + 18x + x2 + -1x2
6 + 18x + -1x2 = -18x + 18x + x2 + -1x2

Combine like terms: -18x + 18x = 0
6 + 18x + -1x2 = 0 + x2 + -1x2
6 + 18x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
6 + 18x + -1x2 = 0

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

Divide each side by '-1'.
-6 + -18x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -18x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + -18x + x2 = 0 + 6

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

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

The x term is -18x.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18x + 81 + x2 = 6 + 81

Reorder the terms:
81 + -18x + x2 = 6 + 81

Combine like terms: 6 + 81 = 87
81 + -18x + x2 = 87

Factor a perfect square on the left side:
(x + -9)(x + -9) = 87

Calculate the square root of the right side: 9.327379053

Break this problem into two subproblems by setting 
(x + -9) equal to 9.327379053 and -9.327379053.

Subproblem 1

x + -9 = 9.327379053 Simplifying x + -9 = 9.327379053 Reorder the terms: -9 + x = 9.327379053 Solving -9 + x = 9.327379053 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = 9.327379053 + 9 Combine like terms: -9 + 9 = 0 0 + x = 9.327379053 + 9 x = 9.327379053 + 9 Combine like terms: 9.327379053 + 9 = 18.327379053 x = 18.327379053 Simplifying x = 18.327379053

Subproblem 2

x + -9 = -9.327379053 Simplifying x + -9 = -9.327379053 Reorder the terms: -9 + x = -9.327379053 Solving -9 + x = -9.327379053 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = -9.327379053 + 9 Combine like terms: -9 + 9 = 0 0 + x = -9.327379053 + 9 x = -9.327379053 + 9 Combine like terms: -9.327379053 + 9 = -0.327379053 x = -0.327379053 Simplifying x = -0.327379053

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.327379053, -0.327379053}

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