w^2+8w-40=0

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Solution for w^2+8w-40=0 equation:


Simplifying
w2 + 8w + -40 = 0

Reorder the terms:
-40 + 8w + w2 = 0

Solving
-40 + 8w + w2 = 0

Solving for variable 'w'.

Begin completing the square.

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + 8w + 40 + w2 = 0 + 40

Reorder the terms:
-40 + 40 + 8w + w2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + 8w + w2 = 0 + 40
8w + w2 = 0 + 40

Combine like terms: 0 + 40 = 40
8w + w2 = 40

The w term is 8w.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8w + 16 + w2 = 40 + 16

Reorder the terms:
16 + 8w + w2 = 40 + 16

Combine like terms: 40 + 16 = 56
16 + 8w + w2 = 56

Factor a perfect square on the left side:
(w + 4)(w + 4) = 56

Calculate the square root of the right side: 7.483314774

Break this problem into two subproblems by setting 
(w + 4) equal to 7.483314774 and -7.483314774.

Subproblem 1

w + 4 = 7.483314774 Simplifying w + 4 = 7.483314774 Reorder the terms: 4 + w = 7.483314774 Solving 4 + w = 7.483314774 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + w = 7.483314774 + -4 Combine like terms: 4 + -4 = 0 0 + w = 7.483314774 + -4 w = 7.483314774 + -4 Combine like terms: 7.483314774 + -4 = 3.483314774 w = 3.483314774 Simplifying w = 3.483314774

Subproblem 2

w + 4 = -7.483314774 Simplifying w + 4 = -7.483314774 Reorder the terms: 4 + w = -7.483314774 Solving 4 + w = -7.483314774 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + w = -7.483314774 + -4 Combine like terms: 4 + -4 = 0 0 + w = -7.483314774 + -4 w = -7.483314774 + -4 Combine like terms: -7.483314774 + -4 = -11.483314774 w = -11.483314774 Simplifying w = -11.483314774

Solution

The solution to the problem is based on the solutions from the subproblems. w = {3.483314774, -11.483314774}

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