15=w^2+4w

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Solution for 15=w^2+4w equation:


Simplifying
15 = w2 + 4w

Reorder the terms:
15 = 4w + w2

Solving
15 = 4w + w2

Solving for variable 'w'.

Reorder the terms:
15 + -4w + -1w2 = 4w + -4w + w2 + -1w2

Combine like terms: 4w + -4w = 0
15 + -4w + -1w2 = 0 + w2 + -1w2
15 + -4w + -1w2 = w2 + -1w2

Combine like terms: w2 + -1w2 = 0
15 + -4w + -1w2 = 0

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

Divide each side by '-1'.
-15 + 4w + w2 = 0

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + 4w + 15 + w2 = 0 + 15

Reorder the terms:
-15 + 15 + 4w + w2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 4w + w2 = 0 + 15
4w + w2 = 0 + 15

Combine like terms: 0 + 15 = 15
4w + w2 = 15

The w term is 4w.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4w + 4 + w2 = 15 + 4

Reorder the terms:
4 + 4w + w2 = 15 + 4

Combine like terms: 15 + 4 = 19
4 + 4w + w2 = 19

Factor a perfect square on the left side:
(w + 2)(w + 2) = 19

Calculate the square root of the right side: 4.358898944

Break this problem into two subproblems by setting 
(w + 2) equal to 4.358898944 and -4.358898944.

Subproblem 1

w + 2 = 4.358898944 Simplifying w + 2 = 4.358898944 Reorder the terms: 2 + w = 4.358898944 Solving 2 + w = 4.358898944 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + w = 4.358898944 + -2 Combine like terms: 2 + -2 = 0 0 + w = 4.358898944 + -2 w = 4.358898944 + -2 Combine like terms: 4.358898944 + -2 = 2.358898944 w = 2.358898944 Simplifying w = 2.358898944

Subproblem 2

w + 2 = -4.358898944 Simplifying w + 2 = -4.358898944 Reorder the terms: 2 + w = -4.358898944 Solving 2 + w = -4.358898944 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + w = -4.358898944 + -2 Combine like terms: 2 + -2 = 0 0 + w = -4.358898944 + -2 w = -4.358898944 + -2 Combine like terms: -4.358898944 + -2 = -6.358898944 w = -6.358898944 Simplifying w = -6.358898944

Solution

The solution to the problem is based on the solutions from the subproblems. w = {2.358898944, -6.358898944}

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