x^2-5x-125=0

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Solution for x^2-5x-125=0 equation:


Simplifying
x2 + -5x + -125 = 0

Reorder the terms:
-125 + -5x + x2 = 0

Solving
-125 + -5x + 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 + -5x + 125 + x2 = 0 + 125

Reorder the terms:
-125 + 125 + -5x + x2 = 0 + 125

Combine like terms: -125 + 125 = 0
0 + -5x + x2 = 0 + 125
-5x + x2 = 0 + 125

Combine like terms: 0 + 125 = 125
-5x + x2 = 125

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 125 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 125 + 6.25

Combine like terms: 125 + 6.25 = 131.25
6.25 + -5x + x2 = 131.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 131.25

Calculate the square root of the right side: 11.456439237

Break this problem into two subproblems by setting 
(x + -2.5) equal to 11.456439237 and -11.456439237.

Subproblem 1

x + -2.5 = 11.456439237 Simplifying x + -2.5 = 11.456439237 Reorder the terms: -2.5 + x = 11.456439237 Solving -2.5 + x = 11.456439237 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 11.456439237 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 11.456439237 + 2.5 x = 11.456439237 + 2.5 Combine like terms: 11.456439237 + 2.5 = 13.956439237 x = 13.956439237 Simplifying x = 13.956439237

Subproblem 2

x + -2.5 = -11.456439237 Simplifying x + -2.5 = -11.456439237 Reorder the terms: -2.5 + x = -11.456439237 Solving -2.5 + x = -11.456439237 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -11.456439237 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -11.456439237 + 2.5 x = -11.456439237 + 2.5 Combine like terms: -11.456439237 + 2.5 = -8.956439237 x = -8.956439237 Simplifying x = -8.956439237

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.956439237, -8.956439237}

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