1-4*(k^2+k)=0

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Solution for 1-4*(k^2+k)=0 equation:


Simplifying
1 + -4(k2 + k) = 0

Reorder the terms:
1 + -4(k + k2) = 0
1 + (k * -4 + k2 * -4) = 0
1 + (-4k + -4k2) = 0

Solving
1 + -4k + -4k2 = 0

Solving for variable 'k'.

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-0.25 + k + k2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + k + 0.25 + k2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + k + k2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + k + k2 = 0 + 0.25
k + k2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
k + k2 = 0.25

The k term is k.  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 + k2 = 0.25 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + k2 = 0.25 + 0.25

Combine like terms: 0.25 + 0.25 = 0.5
1.25 + k2 = 0.5

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

Calculate the square root of the right side: 0.707106781

Break this problem into two subproblems by setting 
(k + 0.5) equal to 0.707106781 and -0.707106781.

Subproblem 1

k + 0.5 = 0.707106781 Simplifying k + 0.5 = 0.707106781 Reorder the terms: 0.5 + k = 0.707106781 Solving 0.5 + k = 0.707106781 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + k = 0.707106781 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + k = 0.707106781 + -0.5 k = 0.707106781 + -0.5 Combine like terms: 0.707106781 + -0.5 = 0.207106781 k = 0.207106781 Simplifying k = 0.207106781

Subproblem 2

k + 0.5 = -0.707106781 Simplifying k + 0.5 = -0.707106781 Reorder the terms: 0.5 + k = -0.707106781 Solving 0.5 + k = -0.707106781 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + k = -0.707106781 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + k = -0.707106781 + -0.5 k = -0.707106781 + -0.5 Combine like terms: -0.707106781 + -0.5 = -1.207106781 k = -1.207106781 Simplifying k = -1.207106781

Solution

The solution to the problem is based on the solutions from the subproblems. k = {0.207106781, -1.207106781}

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