2n^2+2n=1

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Solution for 2n^2+2n=1 equation:


Simplifying
2n2 + 2n = 1

Reorder the terms:
2n + 2n2 = 1

Solving
2n + 2n2 = 1

Solving for variable 'n'.

Reorder the terms:
-1 + 2n + 2n2 = 1 + -1

Combine like terms: 1 + -1 = 0
-1 + 2n + 2n2 = 0

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

Divide each side by '2'.
-0.5 + n + n2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + n + 0.5 + n2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + n + n2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + n + n2 = 0 + 0.5
n + n2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
n + n2 = 0.5

The n term is n.  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 + n2 = 0.5 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + n2 = 0.5 + 0.25

Combine like terms: 0.5 + 0.25 = 0.75
1.25 + n2 = 0.75

Factor a perfect square on the left side:
(n + 0.5)(n + 0.5) = 0.75

Calculate the square root of the right side: 0.866025404

Break this problem into two subproblems by setting 
(n + 0.5) equal to 0.866025404 and -0.866025404.

Subproblem 1

n + 0.5 = 0.866025404 Simplifying n + 0.5 = 0.866025404 Reorder the terms: 0.5 + n = 0.866025404 Solving 0.5 + n = 0.866025404 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + n = 0.866025404 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + n = 0.866025404 + -0.5 n = 0.866025404 + -0.5 Combine like terms: 0.866025404 + -0.5 = 0.366025404 n = 0.366025404 Simplifying n = 0.366025404

Subproblem 2

n + 0.5 = -0.866025404 Simplifying n + 0.5 = -0.866025404 Reorder the terms: 0.5 + n = -0.866025404 Solving 0.5 + n = -0.866025404 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + n = -0.866025404 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + n = -0.866025404 + -0.5 n = -0.866025404 + -0.5 Combine like terms: -0.866025404 + -0.5 = -1.366025404 n = -1.366025404 Simplifying n = -1.366025404

Solution

The solution to the problem is based on the solutions from the subproblems. n = {0.366025404, -1.366025404}

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