(w+0.5)*(w-0.4)=

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Solution for (w+0.5)*(w-0.4)= equation:


Simplifying
(w + 0.5)(w + -0.4) = 0

Reorder the terms:
(0.5 + w)(w + -0.4) = 0

Reorder the terms:
(0.5 + w)(-0.4 + w) = 0

Multiply (0.5 + w) * (-0.4 + w)
(0.5(-0.4 + w) + w(-0.4 + w)) = 0
((-0.4 * 0.5 + w * 0.5) + w(-0.4 + w)) = 0
((-0.2 + 0.5w) + w(-0.4 + w)) = 0
(-0.2 + 0.5w + (-0.4 * w + w * w)) = 0
(-0.2 + 0.5w + (-0.4w + w2)) = 0

Combine like terms: 0.5w + -0.4w = 0.1w
(-0.2 + 0.1w + w2) = 0

Solving
-0.2 + 0.1w + w2 = 0

Solving for variable 'w'.

Begin completing the square.

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + 0.1w + 0.2 + w2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + 0.1w + w2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + 0.1w + w2 = 0 + 0.2
0.1w + w2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
0.1w + w2 = 0.2

The w term is 0.1w.  Take half its coefficient (0.05).
Square it (0.0025) and add it to both sides.

Add '0.0025' to each side of the equation.
0.1w + 0.0025 + w2 = 0.2 + 0.0025

Reorder the terms:
0.0025 + 0.1w + w2 = 0.2 + 0.0025

Combine like terms: 0.2 + 0.0025 = 0.2025
0.0025 + 0.1w + w2 = 0.2025

Factor a perfect square on the left side:
(w + 0.05)(w + 0.05) = 0.2025

Calculate the square root of the right side: 0.45

Break this problem into two subproblems by setting 
(w + 0.05) equal to 0.45 and -0.45.

Subproblem 1

w + 0.05 = 0.45 Simplifying w + 0.05 = 0.45 Reorder the terms: 0.05 + w = 0.45 Solving 0.05 + w = 0.45 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-0.05' to each side of the equation. 0.05 + -0.05 + w = 0.45 + -0.05 Combine like terms: 0.05 + -0.05 = 0.00 0.00 + w = 0.45 + -0.05 w = 0.45 + -0.05 Combine like terms: 0.45 + -0.05 = 0.4 w = 0.4 Simplifying w = 0.4

Subproblem 2

w + 0.05 = -0.45 Simplifying w + 0.05 = -0.45 Reorder the terms: 0.05 + w = -0.45 Solving 0.05 + w = -0.45 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-0.05' to each side of the equation. 0.05 + -0.05 + w = -0.45 + -0.05 Combine like terms: 0.05 + -0.05 = 0.00 0.00 + w = -0.45 + -0.05 w = -0.45 + -0.05 Combine like terms: -0.45 + -0.05 = -0.5 w = -0.5 Simplifying w = -0.5

Solution

The solution to the problem is based on the solutions from the subproblems. w = {0.4, -0.5}

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