w^2+13w+17.25=399

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Solution for w^2+13w+17.25=399 equation:


Simplifying
w2 + 13w + 17.25 = 399

Reorder the terms:
17.25 + 13w + w2 = 399

Solving
17.25 + 13w + w2 = 399

Solving for variable 'w'.

Reorder the terms:
17.25 + -399 + 13w + w2 = 399 + -399

Combine like terms: 17.25 + -399 = -381.75
-381.75 + 13w + w2 = 399 + -399

Combine like terms: 399 + -399 = 0
-381.75 + 13w + w2 = 0

Begin completing the square.

Move the constant term to the right:

Add '381.75' to each side of the equation.
-381.75 + 13w + 381.75 + w2 = 0 + 381.75

Reorder the terms:
-381.75 + 381.75 + 13w + w2 = 0 + 381.75

Combine like terms: -381.75 + 381.75 = 0.00
0.00 + 13w + w2 = 0 + 381.75
13w + w2 = 0 + 381.75

Combine like terms: 0 + 381.75 = 381.75
13w + w2 = 381.75

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 = 381.75 + 42.25

Reorder the terms:
42.25 + 13w + w2 = 381.75 + 42.25

Combine like terms: 381.75 + 42.25 = 424
42.25 + 13w + w2 = 424

Factor a perfect square on the left side:
(w + 6.5)(w + 6.5) = 424

Calculate the square root of the right side: 20.591260282

Break this problem into two subproblems by setting 
(w + 6.5) equal to 20.591260282 and -20.591260282.

Subproblem 1

w + 6.5 = 20.591260282 Simplifying w + 6.5 = 20.591260282 Reorder the terms: 6.5 + w = 20.591260282 Solving 6.5 + w = 20.591260282 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 = 20.591260282 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + w = 20.591260282 + -6.5 w = 20.591260282 + -6.5 Combine like terms: 20.591260282 + -6.5 = 14.091260282 w = 14.091260282 Simplifying w = 14.091260282

Subproblem 2

w + 6.5 = -20.591260282 Simplifying w + 6.5 = -20.591260282 Reorder the terms: 6.5 + w = -20.591260282 Solving 6.5 + w = -20.591260282 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 = -20.591260282 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + w = -20.591260282 + -6.5 w = -20.591260282 + -6.5 Combine like terms: -20.591260282 + -6.5 = -27.091260282 w = -27.091260282 Simplifying w = -27.091260282

Solution

The solution to the problem is based on the solutions from the subproblems. w = {14.091260282, -27.091260282}

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