x^2-18x-324=0

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Solution for x^2-18x-324=0 equation:


Simplifying
x2 + -18x + -324 = 0

Reorder the terms:
-324 + -18x + x2 = 0

Solving
-324 + -18x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '324' to each side of the equation.
-324 + -18x + 324 + x2 = 0 + 324

Reorder the terms:
-324 + 324 + -18x + x2 = 0 + 324

Combine like terms: -324 + 324 = 0
0 + -18x + x2 = 0 + 324
-18x + x2 = 0 + 324

Combine like terms: 0 + 324 = 324
-18x + x2 = 324

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 = 324 + 81

Reorder the terms:
81 + -18x + x2 = 324 + 81

Combine like terms: 324 + 81 = 405
81 + -18x + x2 = 405

Factor a perfect square on the left side:
(x + -9)(x + -9) = 405

Calculate the square root of the right side: 20.124611797

Break this problem into two subproblems by setting 
(x + -9) equal to 20.124611797 and -20.124611797.

Subproblem 1

x + -9 = 20.124611797 Simplifying x + -9 = 20.124611797 Reorder the terms: -9 + x = 20.124611797 Solving -9 + x = 20.124611797 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 = 20.124611797 + 9 Combine like terms: -9 + 9 = 0 0 + x = 20.124611797 + 9 x = 20.124611797 + 9 Combine like terms: 20.124611797 + 9 = 29.124611797 x = 29.124611797 Simplifying x = 29.124611797

Subproblem 2

x + -9 = -20.124611797 Simplifying x + -9 = -20.124611797 Reorder the terms: -9 + x = -20.124611797 Solving -9 + x = -20.124611797 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 = -20.124611797 + 9 Combine like terms: -9 + 9 = 0 0 + x = -20.124611797 + 9 x = -20.124611797 + 9 Combine like terms: -20.124611797 + 9 = -11.124611797 x = -11.124611797 Simplifying x = -11.124611797

Solution

The solution to the problem is based on the solutions from the subproblems. x = {29.124611797, -11.124611797}

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