0=2x^2-10x-5

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Solution for 0=2x^2-10x-5 equation:


Simplifying
0 = 2x2 + -10x + -5

Reorder the terms:
0 = -5 + -10x + 2x2

Solving
0 = -5 + -10x + 2x2

Solving for variable 'x'.

Combine like terms: 0 + 5 = 5
5 + 10x + -2x2 = -5 + -10x + 2x2 + 5 + 10x + -2x2

Reorder the terms:
5 + 10x + -2x2 = -5 + 5 + -10x + 10x + 2x2 + -2x2

Combine like terms: -5 + 5 = 0
5 + 10x + -2x2 = 0 + -10x + 10x + 2x2 + -2x2
5 + 10x + -2x2 = -10x + 10x + 2x2 + -2x2

Combine like terms: -10x + 10x = 0
5 + 10x + -2x2 = 0 + 2x2 + -2x2
5 + 10x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
5 + 10x + -2x2 = 0

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

Divide each side by '-2'.
-2.5 + -5x + x2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -5x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -5x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -5x + x2 = 0 + 2.5
-5x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-5x + x2 = 2.5

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 = 2.5 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 2.5 + 6.25

Combine like terms: 2.5 + 6.25 = 8.75
6.25 + -5x + x2 = 8.75

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 8.75

Calculate the square root of the right side: 2.958039892

Break this problem into two subproblems by setting 
(x + -2.5) equal to 2.958039892 and -2.958039892.

Subproblem 1

x + -2.5 = 2.958039892 Simplifying x + -2.5 = 2.958039892 Reorder the terms: -2.5 + x = 2.958039892 Solving -2.5 + x = 2.958039892 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 = 2.958039892 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 2.958039892 + 2.5 x = 2.958039892 + 2.5 Combine like terms: 2.958039892 + 2.5 = 5.458039892 x = 5.458039892 Simplifying x = 5.458039892

Subproblem 2

x + -2.5 = -2.958039892 Simplifying x + -2.5 = -2.958039892 Reorder the terms: -2.5 + x = -2.958039892 Solving -2.5 + x = -2.958039892 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 = -2.958039892 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -2.958039892 + 2.5 x = -2.958039892 + 2.5 Combine like terms: -2.958039892 + 2.5 = -0.458039892 x = -0.458039892 Simplifying x = -0.458039892

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.458039892, -0.458039892}

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