(2x^2)+2x-105=0

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Solution for (2x^2)+2x-105=0 equation:


Simplifying
(2x2) + 2x + -105 = 0

Reorder the terms:
-105 + 2x + (2x2) = 0

Solving
-105 + 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'.
-52.5 + x + x2 = 0

Move the constant term to the right:

Add '52.5' to each side of the equation.
-52.5 + x + 52.5 + x2 = 0 + 52.5

Reorder the terms:
-52.5 + 52.5 + x + x2 = 0 + 52.5

Combine like terms: -52.5 + 52.5 = 0.0
0.0 + x + x2 = 0 + 52.5
x + x2 = 0 + 52.5

Combine like terms: 0 + 52.5 = 52.5
x + x2 = 52.5

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 = 52.5 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 52.5 + 0.25

Combine like terms: 52.5 + 0.25 = 52.75
1.25 + x2 = 52.75

Factor a perfect square on the left side:
((x) + 0.5)((x) + 0.5) = 52.75

Calculate the square root of the right side: 7.262919523

Break this problem into two subproblems by setting 
((x) + 0.5) equal to 7.262919523 and -7.262919523.

Subproblem 1

(x) + 0.5 = 7.262919523 Simplifying (x) + 0.5 = 7.262919523 x + 0.5 = 7.262919523 Reorder the terms: 0.5 + x = 7.262919523 Solving 0.5 + x = 7.262919523 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 = 7.262919523 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 7.262919523 + -0.5 x = 7.262919523 + -0.5 Combine like terms: 7.262919523 + -0.5 = 6.762919523 x = 6.762919523 Simplifying x = 6.762919523

Subproblem 2

(x) + 0.5 = -7.262919523 Simplifying (x) + 0.5 = -7.262919523 x + 0.5 = -7.262919523 Reorder the terms: 0.5 + x = -7.262919523 Solving 0.5 + x = -7.262919523 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 = -7.262919523 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -7.262919523 + -0.5 x = -7.262919523 + -0.5 Combine like terms: -7.262919523 + -0.5 = -7.762919523 x = -7.762919523 Simplifying x = -7.762919523

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.762919523, -7.762919523}

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