2x^2-2x-125=0

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


Simplifying
2x2 + -2x + -125 = 0

Reorder the terms:
-125 + -2x + 2x2 = 0

Solving
-125 + -2x + 2x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-62.5 + -1x + x2 = 0

Move the constant term to the right:

Add '62.5' to each side of the equation.
-62.5 + -1x + 62.5 + x2 = 0 + 62.5

Reorder the terms:
-62.5 + 62.5 + -1x + x2 = 0 + 62.5

Combine like terms: -62.5 + 62.5 = 0.0
0.0 + -1x + x2 = 0 + 62.5
-1x + x2 = 0 + 62.5

Combine like terms: 0 + 62.5 = 62.5
-1x + x2 = 62.5

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 62.5 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 62.5 + 0.25

Combine like terms: 62.5 + 0.25 = 62.75
0.25 + -1x + x2 = 62.75

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 62.75

Calculate the square root of the right side: 7.921489759

Break this problem into two subproblems by setting 
(x + -0.5) equal to 7.921489759 and -7.921489759.

Subproblem 1

x + -0.5 = 7.921489759 Simplifying x + -0.5 = 7.921489759 Reorder the terms: -0.5 + x = 7.921489759 Solving -0.5 + x = 7.921489759 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 7.921489759 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 7.921489759 + 0.5 x = 7.921489759 + 0.5 Combine like terms: 7.921489759 + 0.5 = 8.421489759 x = 8.421489759 Simplifying x = 8.421489759

Subproblem 2

x + -0.5 = -7.921489759 Simplifying x + -0.5 = -7.921489759 Reorder the terms: -0.5 + x = -7.921489759 Solving -0.5 + x = -7.921489759 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -7.921489759 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -7.921489759 + 0.5 x = -7.921489759 + 0.5 Combine like terms: -7.921489759 + 0.5 = -7.421489759 x = -7.421489759 Simplifying x = -7.421489759

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.421489759, -7.421489759}

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