W^2+7W-20736=0

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Solution for W^2+7W-20736=0 equation:


Simplifying
W2 + 7W + -20736 = 0

Reorder the terms:
-20736 + 7W + W2 = 0

Solving
-20736 + 7W + W2 = 0

Solving for variable 'W'.

Begin completing the square.

Move the constant term to the right:

Add '20736' to each side of the equation.
-20736 + 7W + 20736 + W2 = 0 + 20736

Reorder the terms:
-20736 + 20736 + 7W + W2 = 0 + 20736

Combine like terms: -20736 + 20736 = 0
0 + 7W + W2 = 0 + 20736
7W + W2 = 0 + 20736

Combine like terms: 0 + 20736 = 20736
7W + W2 = 20736

The W term is 7W.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7W + 12.25 + W2 = 20736 + 12.25

Reorder the terms:
12.25 + 7W + W2 = 20736 + 12.25

Combine like terms: 20736 + 12.25 = 20748.25
12.25 + 7W + W2 = 20748.25

Factor a perfect square on the left side:
(W + 3.5)(W + 3.5) = 20748.25

Calculate the square root of the right side: 144.042528442

Break this problem into two subproblems by setting 
(W + 3.5) equal to 144.042528442 and -144.042528442.

Subproblem 1

W + 3.5 = 144.042528442 Simplifying W + 3.5 = 144.042528442 Reorder the terms: 3.5 + W = 144.042528442 Solving 3.5 + W = 144.042528442 Solving for variable 'W'. Move all terms containing W to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + W = 144.042528442 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + W = 144.042528442 + -3.5 W = 144.042528442 + -3.5 Combine like terms: 144.042528442 + -3.5 = 140.542528442 W = 140.542528442 Simplifying W = 140.542528442

Subproblem 2

W + 3.5 = -144.042528442 Simplifying W + 3.5 = -144.042528442 Reorder the terms: 3.5 + W = -144.042528442 Solving 3.5 + W = -144.042528442 Solving for variable 'W'. Move all terms containing W to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + W = -144.042528442 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + W = -144.042528442 + -3.5 W = -144.042528442 + -3.5 Combine like terms: -144.042528442 + -3.5 = -147.542528442 W = -147.542528442 Simplifying W = -147.542528442

Solution

The solution to the problem is based on the solutions from the subproblems. W = {140.542528442, -147.542528442}

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