w(w+2)=85

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Solution for w(w+2)=85 equation:


Simplifying
w(w + 2) = 85

Reorder the terms:
w(2 + w) = 85
(2 * w + w * w) = 85
(2w + w2) = 85

Solving
2w + w2 = 85

Solving for variable 'w'.

Reorder the terms:
-85 + 2w + w2 = 85 + -85

Combine like terms: 85 + -85 = 0
-85 + 2w + w2 = 0

Begin completing the square.

Move the constant term to the right:

Add '85' to each side of the equation.
-85 + 2w + 85 + w2 = 0 + 85

Reorder the terms:
-85 + 85 + 2w + w2 = 0 + 85

Combine like terms: -85 + 85 = 0
0 + 2w + w2 = 0 + 85
2w + w2 = 0 + 85

Combine like terms: 0 + 85 = 85
2w + w2 = 85

The w term is 2w.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2w + 1 + w2 = 85 + 1

Reorder the terms:
1 + 2w + w2 = 85 + 1

Combine like terms: 85 + 1 = 86
1 + 2w + w2 = 86

Factor a perfect square on the left side:
(w + 1)(w + 1) = 86

Calculate the square root of the right side: 9.273618495

Break this problem into two subproblems by setting 
(w + 1) equal to 9.273618495 and -9.273618495.

Subproblem 1

w + 1 = 9.273618495 Simplifying w + 1 = 9.273618495 Reorder the terms: 1 + w = 9.273618495 Solving 1 + w = 9.273618495 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + w = 9.273618495 + -1 Combine like terms: 1 + -1 = 0 0 + w = 9.273618495 + -1 w = 9.273618495 + -1 Combine like terms: 9.273618495 + -1 = 8.273618495 w = 8.273618495 Simplifying w = 8.273618495

Subproblem 2

w + 1 = -9.273618495 Simplifying w + 1 = -9.273618495 Reorder the terms: 1 + w = -9.273618495 Solving 1 + w = -9.273618495 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + w = -9.273618495 + -1 Combine like terms: 1 + -1 = 0 0 + w = -9.273618495 + -1 w = -9.273618495 + -1 Combine like terms: -9.273618495 + -1 = -10.273618495 w = -10.273618495 Simplifying w = -10.273618495

Solution

The solution to the problem is based on the solutions from the subproblems. w = {8.273618495, -10.273618495}

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