x^2+18x=6

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Solution for x^2+18x=6 equation:


Simplifying
x2 + 18x = 6

Reorder the terms:
18x + x2 = 6

Solving
18x + x2 = 6

Solving for variable 'x'.

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

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

Begin completing the square.

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 = 0.327379053 x = 0.327379053 Simplifying x = 0.327379053

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 = -18.327379053 x = -18.327379053 Simplifying x = -18.327379053

Solution

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

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