x^2+36x=231

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Solution for x^2+36x=231 equation:


Simplifying
x2 + 36x = 231

Reorder the terms:
36x + x2 = 231

Solving
36x + x2 = 231

Solving for variable 'x'.

Reorder the terms:
-231 + 36x + x2 = 231 + -231

Combine like terms: 231 + -231 = 0
-231 + 36x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '231' to each side of the equation.
-231 + 36x + 231 + x2 = 0 + 231

Reorder the terms:
-231 + 231 + 36x + x2 = 0 + 231

Combine like terms: -231 + 231 = 0
0 + 36x + x2 = 0 + 231
36x + x2 = 0 + 231

Combine like terms: 0 + 231 = 231
36x + x2 = 231

The x term is 36x.  Take half its coefficient (18).
Square it (324) and add it to both sides.

Add '324' to each side of the equation.
36x + 324 + x2 = 231 + 324

Reorder the terms:
324 + 36x + x2 = 231 + 324

Combine like terms: 231 + 324 = 555
324 + 36x + x2 = 555

Factor a perfect square on the left side:
(x + 18)(x + 18) = 555

Calculate the square root of the right side: 23.558437979

Break this problem into two subproblems by setting 
(x + 18) equal to 23.558437979 and -23.558437979.

Subproblem 1

x + 18 = 23.558437979 Simplifying x + 18 = 23.558437979 Reorder the terms: 18 + x = 23.558437979 Solving 18 + x = 23.558437979 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + x = 23.558437979 + -18 Combine like terms: 18 + -18 = 0 0 + x = 23.558437979 + -18 x = 23.558437979 + -18 Combine like terms: 23.558437979 + -18 = 5.558437979 x = 5.558437979 Simplifying x = 5.558437979

Subproblem 2

x + 18 = -23.558437979 Simplifying x + 18 = -23.558437979 Reorder the terms: 18 + x = -23.558437979 Solving 18 + x = -23.558437979 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + x = -23.558437979 + -18 Combine like terms: 18 + -18 = 0 0 + x = -23.558437979 + -18 x = -23.558437979 + -18 Combine like terms: -23.558437979 + -18 = -41.558437979 x = -41.558437979 Simplifying x = -41.558437979

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.558437979, -41.558437979}

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