(w^2)+13w+28=100

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Solution for (w^2)+13w+28=100 equation:


Simplifying
(w2) + 13w + 28 = 100
w2 + 13w + 28 = 100

Reorder the terms:
28 + 13w + w2 = 100

Solving
28 + 13w + w2 = 100

Solving for variable 'w'.

Reorder the terms:
28 + -100 + 13w + w2 = 100 + -100

Combine like terms: 28 + -100 = -72
-72 + 13w + w2 = 100 + -100

Combine like terms: 100 + -100 = 0
-72 + 13w + w2 = 0

Begin completing the square.

Move the constant term to the right:

Add '72' to each side of the equation.
-72 + 13w + 72 + w2 = 0 + 72

Reorder the terms:
-72 + 72 + 13w + w2 = 0 + 72

Combine like terms: -72 + 72 = 0
0 + 13w + w2 = 0 + 72
13w + w2 = 0 + 72

Combine like terms: 0 + 72 = 72
13w + w2 = 72

The w term is 13w.  Take half its coefficient (6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
13w + 42.25 + w2 = 72 + 42.25

Reorder the terms:
42.25 + 13w + w2 = 72 + 42.25

Combine like terms: 72 + 42.25 = 114.25
42.25 + 13w + w2 = 114.25

Factor a perfect square on the left side:
(w + 6.5)(w + 6.5) = 114.25

Calculate the square root of the right side: 10.688779163

Break this problem into two subproblems by setting 
(w + 6.5) equal to 10.688779163 and -10.688779163.

Subproblem 1

w + 6.5 = 10.688779163 Simplifying w + 6.5 = 10.688779163 Reorder the terms: 6.5 + w = 10.688779163 Solving 6.5 + w = 10.688779163 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + w = 10.688779163 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + w = 10.688779163 + -6.5 w = 10.688779163 + -6.5 Combine like terms: 10.688779163 + -6.5 = 4.188779163 w = 4.188779163 Simplifying w = 4.188779163

Subproblem 2

w + 6.5 = -10.688779163 Simplifying w + 6.5 = -10.688779163 Reorder the terms: 6.5 + w = -10.688779163 Solving 6.5 + w = -10.688779163 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + w = -10.688779163 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + w = -10.688779163 + -6.5 w = -10.688779163 + -6.5 Combine like terms: -10.688779163 + -6.5 = -17.188779163 w = -17.188779163 Simplifying w = -17.188779163

Solution

The solution to the problem is based on the solutions from the subproblems. w = {4.188779163, -17.188779163}

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