21=w(2w-2)

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Solution for 21=w(2w-2) equation:


Simplifying
21 = w(2w + -2)

Reorder the terms:
21 = w(-2 + 2w)
21 = (-2 * w + 2w * w)
21 = (-2w + 2w2)

Solving
21 = -2w + 2w2

Solving for variable 'w'.

Reorder the terms:
21 + 2w + -2w2 = -2w + 2w + 2w2 + -2w2

Combine like terms: -2w + 2w = 0
21 + 2w + -2w2 = 0 + 2w2 + -2w2
21 + 2w + -2w2 = 2w2 + -2w2

Combine like terms: 2w2 + -2w2 = 0
21 + 2w + -2w2 = 0

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

Divide each side by '-2'.
-10.5 + -1w + w2 = 0

Move the constant term to the right:

Add '10.5' to each side of the equation.
-10.5 + -1w + 10.5 + w2 = 0 + 10.5

Reorder the terms:
-10.5 + 10.5 + -1w + w2 = 0 + 10.5

Combine like terms: -10.5 + 10.5 = 0.0
0.0 + -1w + w2 = 0 + 10.5
-1w + w2 = 0 + 10.5

Combine like terms: 0 + 10.5 = 10.5
-1w + w2 = 10.5

The w term is -1w.  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.
-1w + 0.25 + w2 = 10.5 + 0.25

Reorder the terms:
0.25 + -1w + w2 = 10.5 + 0.25

Combine like terms: 10.5 + 0.25 = 10.75
0.25 + -1w + w2 = 10.75

Factor a perfect square on the left side:
(w + -0.5)(w + -0.5) = 10.75

Calculate the square root of the right side: 3.278719262

Break this problem into two subproblems by setting 
(w + -0.5) equal to 3.278719262 and -3.278719262.

Subproblem 1

w + -0.5 = 3.278719262 Simplifying w + -0.5 = 3.278719262 Reorder the terms: -0.5 + w = 3.278719262 Solving -0.5 + w = 3.278719262 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + w = 3.278719262 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + w = 3.278719262 + 0.5 w = 3.278719262 + 0.5 Combine like terms: 3.278719262 + 0.5 = 3.778719262 w = 3.778719262 Simplifying w = 3.778719262

Subproblem 2

w + -0.5 = -3.278719262 Simplifying w + -0.5 = -3.278719262 Reorder the terms: -0.5 + w = -3.278719262 Solving -0.5 + w = -3.278719262 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + w = -3.278719262 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + w = -3.278719262 + 0.5 w = -3.278719262 + 0.5 Combine like terms: -3.278719262 + 0.5 = -2.778719262 w = -2.778719262 Simplifying w = -2.778719262

Solution

The solution to the problem is based on the solutions from the subproblems. w = {3.778719262, -2.778719262}

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