x^2-36x-125=0

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Solution for x^2-36x-125=0 equation:


Simplifying
x2 + -36x + -125 = 0

Reorder the terms:
-125 + -36x + x2 = 0

Solving
-125 + -36x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '125' to each side of the equation.
-125 + -36x + 125 + x2 = 0 + 125

Reorder the terms:
-125 + 125 + -36x + x2 = 0 + 125

Combine like terms: -125 + 125 = 0
0 + -36x + x2 = 0 + 125
-36x + x2 = 0 + 125

Combine like terms: 0 + 125 = 125
-36x + x2 = 125

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 = 125 + 324

Reorder the terms:
324 + -36x + x2 = 125 + 324

Combine like terms: 125 + 324 = 449
324 + -36x + x2 = 449

Factor a perfect square on the left side:
(x + -18)(x + -18) = 449

Calculate the square root of the right side: 21.1896201

Break this problem into two subproblems by setting 
(x + -18) equal to 21.1896201 and -21.1896201.

Subproblem 1

x + -18 = 21.1896201 Simplifying x + -18 = 21.1896201 Reorder the terms: -18 + x = 21.1896201 Solving -18 + x = 21.1896201 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 = 21.1896201 + 18 Combine like terms: -18 + 18 = 0 0 + x = 21.1896201 + 18 x = 21.1896201 + 18 Combine like terms: 21.1896201 + 18 = 39.1896201 x = 39.1896201 Simplifying x = 39.1896201

Subproblem 2

x + -18 = -21.1896201 Simplifying x + -18 = -21.1896201 Reorder the terms: -18 + x = -21.1896201 Solving -18 + x = -21.1896201 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 = -21.1896201 + 18 Combine like terms: -18 + 18 = 0 0 + x = -21.1896201 + 18 x = -21.1896201 + 18 Combine like terms: -21.1896201 + 18 = -3.1896201 x = -3.1896201 Simplifying x = -3.1896201

Solution

The solution to the problem is based on the solutions from the subproblems. x = {39.1896201, -3.1896201}

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