2x^2-2x-225=0

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Solution for 2x^2-2x-225=0 equation:


Simplifying
2x2 + -2x + -225 = 0

Reorder the terms:
-225 + -2x + 2x2 = 0

Solving
-225 + -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'.
-112.5 + -1x + x2 = 0

Move the constant term to the right:

Add '112.5' to each side of the equation.
-112.5 + -1x + 112.5 + x2 = 0 + 112.5

Reorder the terms:
-112.5 + 112.5 + -1x + x2 = 0 + 112.5

Combine like terms: -112.5 + 112.5 = 0.0
0.0 + -1x + x2 = 0 + 112.5
-1x + x2 = 0 + 112.5

Combine like terms: 0 + 112.5 = 112.5
-1x + x2 = 112.5

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 = 112.5 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 112.5 + 0.25

Combine like terms: 112.5 + 0.25 = 112.75
0.25 + -1x + x2 = 112.75

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 112.75

Calculate the square root of the right side: 10.618380291

Break this problem into two subproblems by setting 
(x + -0.5) equal to 10.618380291 and -10.618380291.

Subproblem 1

x + -0.5 = 10.618380291 Simplifying x + -0.5 = 10.618380291 Reorder the terms: -0.5 + x = 10.618380291 Solving -0.5 + x = 10.618380291 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 = 10.618380291 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 10.618380291 + 0.5 x = 10.618380291 + 0.5 Combine like terms: 10.618380291 + 0.5 = 11.118380291 x = 11.118380291 Simplifying x = 11.118380291

Subproblem 2

x + -0.5 = -10.618380291 Simplifying x + -0.5 = -10.618380291 Reorder the terms: -0.5 + x = -10.618380291 Solving -0.5 + x = -10.618380291 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 = -10.618380291 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -10.618380291 + 0.5 x = -10.618380291 + 0.5 Combine like terms: -10.618380291 + 0.5 = -10.118380291 x = -10.118380291 Simplifying x = -10.118380291

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.118380291, -10.118380291}

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