-8w=w^2-15

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Solution for -8w=w^2-15 equation:


Simplifying
-8w = w2 + -15

Reorder the terms:
-8w = -15 + w2

Solving
-8w = -15 + w2

Solving for variable 'w'.

Reorder the terms:
15 + -8w + -1w2 = -15 + w2 + 15 + -1w2

Reorder the terms:
15 + -8w + -1w2 = -15 + 15 + w2 + -1w2

Combine like terms: -15 + 15 = 0
15 + -8w + -1w2 = 0 + w2 + -1w2
15 + -8w + -1w2 = w2 + -1w2

Combine like terms: w2 + -1w2 = 0
15 + -8w + -1w2 = 0

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

Divide each side by '-1'.
-15 + 8w + w2 = 0

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + 8w + 15 + w2 = 0 + 15

Reorder the terms:
-15 + 15 + 8w + w2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 8w + w2 = 0 + 15
8w + w2 = 0 + 15

Combine like terms: 0 + 15 = 15
8w + w2 = 15

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 = 15 + 16

Reorder the terms:
16 + 8w + w2 = 15 + 16

Combine like terms: 15 + 16 = 31
16 + 8w + w2 = 31

Factor a perfect square on the left side:
(w + 4)(w + 4) = 31

Calculate the square root of the right side: 5.567764363

Break this problem into two subproblems by setting 
(w + 4) equal to 5.567764363 and -5.567764363.

Subproblem 1

w + 4 = 5.567764363 Simplifying w + 4 = 5.567764363 Reorder the terms: 4 + w = 5.567764363 Solving 4 + w = 5.567764363 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 = 5.567764363 + -4 Combine like terms: 4 + -4 = 0 0 + w = 5.567764363 + -4 w = 5.567764363 + -4 Combine like terms: 5.567764363 + -4 = 1.567764363 w = 1.567764363 Simplifying w = 1.567764363

Subproblem 2

w + 4 = -5.567764363 Simplifying w + 4 = -5.567764363 Reorder the terms: 4 + w = -5.567764363 Solving 4 + w = -5.567764363 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 = -5.567764363 + -4 Combine like terms: 4 + -4 = 0 0 + w = -5.567764363 + -4 w = -5.567764363 + -4 Combine like terms: -5.567764363 + -4 = -9.567764363 w = -9.567764363 Simplifying w = -9.567764363

Solution

The solution to the problem is based on the solutions from the subproblems. w = {1.567764363, -9.567764363}

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