x^2-18x-1=-6

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Solution for x^2-18x-1=-6 equation:


Simplifying
x2 + -18x + -1 = -6

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

Solving
-1 + -18x + x2 = -6

Solving for variable 'x'.

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

Combine like terms: -1 + 6 = 5
5 + -18x + x2 = -6 + 6

Combine like terms: -6 + 6 = 0
5 + -18x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-5' to each side of the equation.
5 + -18x + -5 + x2 = 0 + -5

Reorder the terms:
5 + -5 + -18x + x2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -18x + x2 = 0 + -5
-18x + x2 = 0 + -5

Combine like terms: 0 + -5 = -5
-18x + x2 = -5

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 = -5 + 81

Reorder the terms:
81 + -18x + x2 = -5 + 81

Combine like terms: -5 + 81 = 76
81 + -18x + x2 = 76

Factor a perfect square on the left side:
(x + -9)(x + -9) = 76

Calculate the square root of the right side: 8.717797887

Break this problem into two subproblems by setting 
(x + -9) equal to 8.717797887 and -8.717797887.

Subproblem 1

x + -9 = 8.717797887 Simplifying x + -9 = 8.717797887 Reorder the terms: -9 + x = 8.717797887 Solving -9 + x = 8.717797887 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 = 8.717797887 + 9 Combine like terms: -9 + 9 = 0 0 + x = 8.717797887 + 9 x = 8.717797887 + 9 Combine like terms: 8.717797887 + 9 = 17.717797887 x = 17.717797887 Simplifying x = 17.717797887

Subproblem 2

x + -9 = -8.717797887 Simplifying x + -9 = -8.717797887 Reorder the terms: -9 + x = -8.717797887 Solving -9 + x = -8.717797887 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 = -8.717797887 + 9 Combine like terms: -9 + 9 = 0 0 + x = -8.717797887 + 9 x = -8.717797887 + 9 Combine like terms: -8.717797887 + 9 = 0.282202113 x = 0.282202113 Simplifying x = 0.282202113

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.717797887, 0.282202113}

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