2x^2-5x-5=0

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


Simplifying
2x2 + -5x + -5 = 0

Reorder the terms:
-5 + -5x + 2x2 = 0

Solving
-5 + -5x + 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'.
-2.5 + -2.5x + x2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -2.5x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -2.5x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -2.5x + x2 = 0 + 2.5
-2.5x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-2.5x + x2 = 2.5

The x term is -2.5x.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5x + 1.5625 + x2 = 2.5 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 2.5 + 1.5625

Combine like terms: 2.5 + 1.5625 = 4.0625
1.5625 + -2.5x + x2 = 4.0625

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 4.0625

Calculate the square root of the right side: 2.015564437

Break this problem into two subproblems by setting 
(x + -1.25) equal to 2.015564437 and -2.015564437.

Subproblem 1

x + -1.25 = 2.015564437 Simplifying x + -1.25 = 2.015564437 Reorder the terms: -1.25 + x = 2.015564437 Solving -1.25 + x = 2.015564437 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = 2.015564437 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 2.015564437 + 1.25 x = 2.015564437 + 1.25 Combine like terms: 2.015564437 + 1.25 = 3.265564437 x = 3.265564437 Simplifying x = 3.265564437

Subproblem 2

x + -1.25 = -2.015564437 Simplifying x + -1.25 = -2.015564437 Reorder the terms: -1.25 + x = -2.015564437 Solving -1.25 + x = -2.015564437 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = -2.015564437 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -2.015564437 + 1.25 x = -2.015564437 + 1.25 Combine like terms: -2.015564437 + 1.25 = -0.765564437 x = -0.765564437 Simplifying x = -0.765564437

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.265564437, -0.765564437}

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