.42w*.42w-.04w=.28

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Solution for .42w*.42w-.04w=.28 equation:


Simplifying
0.42w * 0.42w + -0.04w = 0.28

Reorder the terms for easier multiplication:
0.42 * 0.42w * w + -0.04w = 0.28

Multiply 0.42 * 0.42
0.1764w * w + -0.04w = 0.28

Multiply w * w
0.1764w2 + -0.04w = 0.28

Reorder the terms:
-0.04w + 0.1764w2 = 0.28

Solving
-0.04w + 0.1764w2 = 0.28

Solving for variable 'w'.

Reorder the terms:
-0.28 + -0.04w + 0.1764w2 = 0.28 + -0.28

Combine like terms: 0.28 + -0.28 = 0.00
-0.28 + -0.04w + 0.1764w2 = 0.00

Begin completing the square.  Divide all terms by
0.1764 the coefficient of the squared term: 

Divide each side by '0.1764'.
-1.587301587 + -0.2267573696w + w2 = 0

Move the constant term to the right:

Add '1.587301587' to each side of the equation.
-1.587301587 + -0.2267573696w + 1.587301587 + w2 = 0 + 1.587301587

Reorder the terms:
-1.587301587 + 1.587301587 + -0.2267573696w + w2 = 0 + 1.587301587

Combine like terms: -1.587301587 + 1.587301587 = 0.000000000
0.000000000 + -0.2267573696w + w2 = 0 + 1.587301587
-0.2267573696w + w2 = 0 + 1.587301587

Combine like terms: 0 + 1.587301587 = 1.587301587
-0.2267573696w + w2 = 1.587301587

The w term is -0.2267573696w.  Take half its coefficient (-0.1133786848).
Square it (0.01285472617) and add it to both sides.

Add '0.01285472617' to each side of the equation.
-0.2267573696w + 0.01285472617 + w2 = 1.587301587 + 0.01285472617

Reorder the terms:
0.01285472617 + -0.2267573696w + w2 = 1.587301587 + 0.01285472617

Combine like terms: 1.587301587 + 0.01285472617 = 1.60015631317
0.01285472617 + -0.2267573696w + w2 = 1.60015631317

Factor a perfect square on the left side:
(w + -0.1133786848)(w + -0.1133786848) = 1.60015631317

Calculate the square root of the right side: 1.264972851

Break this problem into two subproblems by setting 
(w + -0.1133786848) equal to 1.264972851 and -1.264972851.

Subproblem 1

w + -0.1133786848 = 1.264972851 Simplifying w + -0.1133786848 = 1.264972851 Reorder the terms: -0.1133786848 + w = 1.264972851 Solving -0.1133786848 + w = 1.264972851 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '0.1133786848' to each side of the equation. -0.1133786848 + 0.1133786848 + w = 1.264972851 + 0.1133786848 Combine like terms: -0.1133786848 + 0.1133786848 = 0.0000000000 0.0000000000 + w = 1.264972851 + 0.1133786848 w = 1.264972851 + 0.1133786848 Combine like terms: 1.264972851 + 0.1133786848 = 1.3783515358 w = 1.3783515358 Simplifying w = 1.3783515358

Subproblem 2

w + -0.1133786848 = -1.264972851 Simplifying w + -0.1133786848 = -1.264972851 Reorder the terms: -0.1133786848 + w = -1.264972851 Solving -0.1133786848 + w = -1.264972851 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '0.1133786848' to each side of the equation. -0.1133786848 + 0.1133786848 + w = -1.264972851 + 0.1133786848 Combine like terms: -0.1133786848 + 0.1133786848 = 0.0000000000 0.0000000000 + w = -1.264972851 + 0.1133786848 w = -1.264972851 + 0.1133786848 Combine like terms: -1.264972851 + 0.1133786848 = -1.1515941662 w = -1.1515941662 Simplifying w = -1.1515941662

Solution

The solution to the problem is based on the solutions from the subproblems. w = {1.3783515358, -1.1515941662}

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