2x^2+2x=23

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Solution for 2x^2+2x=23 equation:


Simplifying
2x2 + 2x = 23

Reorder the terms:
2x + 2x2 = 23

Solving
2x + 2x2 = 23

Solving for variable 'x'.

Reorder the terms:
-23 + 2x + 2x2 = 23 + -23

Combine like terms: 23 + -23 = 0
-23 + 2x + 2x2 = 0

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

Divide each side by '2'.
-11.5 + x + x2 = 0

Move the constant term to the right:

Add '11.5' to each side of the equation.
-11.5 + x + 11.5 + x2 = 0 + 11.5

Reorder the terms:
-11.5 + 11.5 + x + x2 = 0 + 11.5

Combine like terms: -11.5 + 11.5 = 0.0
0.0 + x + x2 = 0 + 11.5
x + x2 = 0 + 11.5

Combine like terms: 0 + 11.5 = 11.5
x + x2 = 11.5

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 = 11.5 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 11.5 + 0.25

Combine like terms: 11.5 + 0.25 = 11.75
1.25 + x2 = 11.75

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 11.75

Calculate the square root of the right side: 3.4278273

Break this problem into two subproblems by setting 
(x + 0.5) equal to 3.4278273 and -3.4278273.

Subproblem 1

x + 0.5 = 3.4278273 Simplifying x + 0.5 = 3.4278273 Reorder the terms: 0.5 + x = 3.4278273 Solving 0.5 + x = 3.4278273 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 = 3.4278273 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 3.4278273 + -0.5 x = 3.4278273 + -0.5 Combine like terms: 3.4278273 + -0.5 = 2.9278273 x = 2.9278273 Simplifying x = 2.9278273

Subproblem 2

x + 0.5 = -3.4278273 Simplifying x + 0.5 = -3.4278273 Reorder the terms: 0.5 + x = -3.4278273 Solving 0.5 + x = -3.4278273 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 = -3.4278273 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -3.4278273 + -0.5 x = -3.4278273 + -0.5 Combine like terms: -3.4278273 + -0.5 = -3.9278273 x = -3.9278273 Simplifying x = -3.9278273

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.9278273, -3.9278273}

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