w^2-2w-8=8

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Solution for w^2-2w-8=8 equation:


Simplifying
w2 + -2w + -8 = 8

Reorder the terms:
-8 + -2w + w2 = 8

Solving
-8 + -2w + w2 = 8

Solving for variable 'w'.

Reorder the terms:
-8 + -8 + -2w + w2 = 8 + -8

Combine like terms: -8 + -8 = -16
-16 + -2w + w2 = 8 + -8

Combine like terms: 8 + -8 = 0
-16 + -2w + w2 = 0

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + -2w + 16 + w2 = 0 + 16

Reorder the terms:
-16 + 16 + -2w + w2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + -2w + w2 = 0 + 16
-2w + w2 = 0 + 16

Combine like terms: 0 + 16 = 16
-2w + w2 = 16

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 = 16 + 1

Reorder the terms:
1 + -2w + w2 = 16 + 1

Combine like terms: 16 + 1 = 17
1 + -2w + w2 = 17

Factor a perfect square on the left side:
(w + -1)(w + -1) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(w + -1) equal to 4.123105626 and -4.123105626.

Subproblem 1

w + -1 = 4.123105626 Simplifying w + -1 = 4.123105626 Reorder the terms: -1 + w = 4.123105626 Solving -1 + w = 4.123105626 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 = 4.123105626 + 1 Combine like terms: -1 + 1 = 0 0 + w = 4.123105626 + 1 w = 4.123105626 + 1 Combine like terms: 4.123105626 + 1 = 5.123105626 w = 5.123105626 Simplifying w = 5.123105626

Subproblem 2

w + -1 = -4.123105626 Simplifying w + -1 = -4.123105626 Reorder the terms: -1 + w = -4.123105626 Solving -1 + w = -4.123105626 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 = -4.123105626 + 1 Combine like terms: -1 + 1 = 0 0 + w = -4.123105626 + 1 w = -4.123105626 + 1 Combine like terms: -4.123105626 + 1 = -3.123105626 w = -3.123105626 Simplifying w = -3.123105626

Solution

The solution to the problem is based on the solutions from the subproblems. w = {5.123105626, -3.123105626}

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