(w+1.2)(w-7.1)=0

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Solution for (w+1.2)(w-7.1)=0 equation:


Simplifying
(w + 1.2)(w + -7.1) = 0

Reorder the terms:
(1.2 + w)(w + -7.1) = 0

Reorder the terms:
(1.2 + w)(-7.1 + w) = 0

Multiply (1.2 + w) * (-7.1 + w)
(1.2(-7.1 + w) + w(-7.1 + w)) = 0
((-7.1 * 1.2 + w * 1.2) + w(-7.1 + w)) = 0
((-8.52 + 1.2w) + w(-7.1 + w)) = 0
(-8.52 + 1.2w + (-7.1 * w + w * w)) = 0
(-8.52 + 1.2w + (-7.1w + w2)) = 0

Combine like terms: 1.2w + -7.1w = -5.9w
(-8.52 + -5.9w + w2) = 0

Solving
-8.52 + -5.9w + w2 = 0

Solving for variable 'w'.

Begin completing the square.

Move the constant term to the right:

Add '8.52' to each side of the equation.
-8.52 + -5.9w + 8.52 + w2 = 0 + 8.52

Reorder the terms:
-8.52 + 8.52 + -5.9w + w2 = 0 + 8.52

Combine like terms: -8.52 + 8.52 = 0.00
0.00 + -5.9w + w2 = 0 + 8.52
-5.9w + w2 = 0 + 8.52

Combine like terms: 0 + 8.52 = 8.52
-5.9w + w2 = 8.52

The w term is -5.9w.  Take half its coefficient (-2.95).
Square it (8.7025) and add it to both sides.

Add '8.7025' to each side of the equation.
-5.9w + 8.7025 + w2 = 8.52 + 8.7025

Reorder the terms:
8.7025 + -5.9w + w2 = 8.52 + 8.7025

Combine like terms: 8.52 + 8.7025 = 17.2225
8.7025 + -5.9w + w2 = 17.2225

Factor a perfect square on the left side:
(w + -2.95)(w + -2.95) = 17.2225

Calculate the square root of the right side: 4.15

Break this problem into two subproblems by setting 
(w + -2.95) equal to 4.15 and -4.15.

Subproblem 1

w + -2.95 = 4.15 Simplifying w + -2.95 = 4.15 Reorder the terms: -2.95 + w = 4.15 Solving -2.95 + w = 4.15 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '2.95' to each side of the equation. -2.95 + 2.95 + w = 4.15 + 2.95 Combine like terms: -2.95 + 2.95 = 0.00 0.00 + w = 4.15 + 2.95 w = 4.15 + 2.95 Combine like terms: 4.15 + 2.95 = 7.1 w = 7.1 Simplifying w = 7.1

Subproblem 2

w + -2.95 = -4.15 Simplifying w + -2.95 = -4.15 Reorder the terms: -2.95 + w = -4.15 Solving -2.95 + w = -4.15 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '2.95' to each side of the equation. -2.95 + 2.95 + w = -4.15 + 2.95 Combine like terms: -2.95 + 2.95 = 0.00 0.00 + w = -4.15 + 2.95 w = -4.15 + 2.95 Combine like terms: -4.15 + 2.95 = -1.2 w = -1.2 Simplifying w = -1.2

Solution

The solution to the problem is based on the solutions from the subproblems. w = {7.1, -1.2}

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