0=w^2-4w-2

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Solution for 0=w^2-4w-2 equation:


Simplifying
0 = w2 + -4w + -2

Reorder the terms:
0 = -2 + -4w + w2

Solving
0 = -2 + -4w + w2

Solving for variable 'w'.

Combine like terms: 0 + 2 = 2
2 + 4w + -1w2 = -2 + -4w + w2 + 2 + 4w + -1w2

Reorder the terms:
2 + 4w + -1w2 = -2 + 2 + -4w + 4w + w2 + -1w2

Combine like terms: -2 + 2 = 0
2 + 4w + -1w2 = 0 + -4w + 4w + w2 + -1w2
2 + 4w + -1w2 = -4w + 4w + w2 + -1w2

Combine like terms: -4w + 4w = 0
2 + 4w + -1w2 = 0 + w2 + -1w2
2 + 4w + -1w2 = w2 + -1w2

Combine like terms: w2 + -1w2 = 0
2 + 4w + -1w2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-2 + -4w + w2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -4w + 2 + w2 = 0 + 2

Reorder the terms:
-2 + 2 + -4w + w2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -4w + w2 = 0 + 2
-4w + w2 = 0 + 2

Combine like terms: 0 + 2 = 2
-4w + w2 = 2

The w term is -4w.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4w + 4 + w2 = 2 + 4

Reorder the terms:
4 + -4w + w2 = 2 + 4

Combine like terms: 2 + 4 = 6
4 + -4w + w2 = 6

Factor a perfect square on the left side:
(w + -2)(w + -2) = 6

Calculate the square root of the right side: 2.449489743

Break this problem into two subproblems by setting 
(w + -2) equal to 2.449489743 and -2.449489743.

Subproblem 1

w + -2 = 2.449489743 Simplifying w + -2 = 2.449489743 Reorder the terms: -2 + w = 2.449489743 Solving -2 + w = 2.449489743 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + w = 2.449489743 + 2 Combine like terms: -2 + 2 = 0 0 + w = 2.449489743 + 2 w = 2.449489743 + 2 Combine like terms: 2.449489743 + 2 = 4.449489743 w = 4.449489743 Simplifying w = 4.449489743

Subproblem 2

w + -2 = -2.449489743 Simplifying w + -2 = -2.449489743 Reorder the terms: -2 + w = -2.449489743 Solving -2 + w = -2.449489743 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + w = -2.449489743 + 2 Combine like terms: -2 + 2 = 0 0 + w = -2.449489743 + 2 w = -2.449489743 + 2 Combine like terms: -2.449489743 + 2 = -0.449489743 w = -0.449489743 Simplifying w = -0.449489743

Solution

The solution to the problem is based on the solutions from the subproblems. w = {4.449489743, -0.449489743}

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