0=2x^2+2x-5

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


Simplifying
0 = 2x2 + 2x + -5

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

Solving
0 = -5 + 2x + 2x2

Solving for variable 'x'.

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

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

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

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

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

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

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

Move the constant term to the right:

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

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

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

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

The x term is x.  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.
 + 0.25 + x2 = 2.5 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 2.5 + 0.25

Combine like terms: 2.5 + 0.25 = 2.75
1.25 + x2 = 2.75

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 2.75

Calculate the square root of the right side: 1.658312395

Break this problem into two subproblems by setting 
(x + 0.5) equal to 1.658312395 and -1.658312395.

Subproblem 1

x + 0.5 = 1.658312395 Simplifying x + 0.5 = 1.658312395 Reorder the terms: 0.5 + x = 1.658312395 Solving 0.5 + x = 1.658312395 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 = 1.658312395 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 1.658312395 + -0.5 x = 1.658312395 + -0.5 Combine like terms: 1.658312395 + -0.5 = 1.158312395 x = 1.158312395 Simplifying x = 1.158312395

Subproblem 2

x + 0.5 = -1.658312395 Simplifying x + 0.5 = -1.658312395 Reorder the terms: 0.5 + x = -1.658312395 Solving 0.5 + x = -1.658312395 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 = -1.658312395 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -1.658312395 + -0.5 x = -1.658312395 + -0.5 Combine like terms: -1.658312395 + -0.5 = -2.158312395 x = -2.158312395 Simplifying x = -2.158312395

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.158312395, -2.158312395}

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