0=w^2+6w-18

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Solution for 0=w^2+6w-18 equation:


Simplifying
0 = w2 + 6w + -18

Reorder the terms:
0 = -18 + 6w + w2

Solving
0 = -18 + 6w + w2

Solving for variable 'w'.

Combine like terms: 0 + 18 = 18
18 + -6w + -1w2 = -18 + 6w + w2 + 18 + -6w + -1w2

Reorder the terms:
18 + -6w + -1w2 = -18 + 18 + 6w + -6w + w2 + -1w2

Combine like terms: -18 + 18 = 0
18 + -6w + -1w2 = 0 + 6w + -6w + w2 + -1w2
18 + -6w + -1w2 = 6w + -6w + w2 + -1w2

Combine like terms: 6w + -6w = 0
18 + -6w + -1w2 = 0 + w2 + -1w2
18 + -6w + -1w2 = w2 + -1w2

Combine like terms: w2 + -1w2 = 0
18 + -6w + -1w2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-18 + 6w + w2 = 0

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + 6w + 18 + w2 = 0 + 18

Reorder the terms:
-18 + 18 + 6w + w2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + 6w + w2 = 0 + 18
6w + w2 = 0 + 18

Combine like terms: 0 + 18 = 18
6w + w2 = 18

The w term is 6w.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6w + 9 + w2 = 18 + 9

Reorder the terms:
9 + 6w + w2 = 18 + 9

Combine like terms: 18 + 9 = 27
9 + 6w + w2 = 27

Factor a perfect square on the left side:
(w + 3)(w + 3) = 27

Calculate the square root of the right side: 5.196152423

Break this problem into two subproblems by setting 
(w + 3) equal to 5.196152423 and -5.196152423.

Subproblem 1

w + 3 = 5.196152423 Simplifying w + 3 = 5.196152423 Reorder the terms: 3 + w = 5.196152423 Solving 3 + w = 5.196152423 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + w = 5.196152423 + -3 Combine like terms: 3 + -3 = 0 0 + w = 5.196152423 + -3 w = 5.196152423 + -3 Combine like terms: 5.196152423 + -3 = 2.196152423 w = 2.196152423 Simplifying w = 2.196152423

Subproblem 2

w + 3 = -5.196152423 Simplifying w + 3 = -5.196152423 Reorder the terms: 3 + w = -5.196152423 Solving 3 + w = -5.196152423 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + w = -5.196152423 + -3 Combine like terms: 3 + -3 = 0 0 + w = -5.196152423 + -3 w = -5.196152423 + -3 Combine like terms: -5.196152423 + -3 = -8.196152423 w = -8.196152423 Simplifying w = -8.196152423

Solution

The solution to the problem is based on the solutions from the subproblems. w = {2.196152423, -8.196152423}

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