w^2-28w+91=0

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Solution for w^2-28w+91=0 equation:


Simplifying
w2 + -28w + 91 = 0

Reorder the terms:
91 + -28w + w2 = 0

Solving
91 + -28w + w2 = 0

Solving for variable 'w'.

Begin completing the square.

Move the constant term to the right:

Add '-91' to each side of the equation.
91 + -28w + -91 + w2 = 0 + -91

Reorder the terms:
91 + -91 + -28w + w2 = 0 + -91

Combine like terms: 91 + -91 = 0
0 + -28w + w2 = 0 + -91
-28w + w2 = 0 + -91

Combine like terms: 0 + -91 = -91
-28w + w2 = -91

The w term is -28w.  Take half its coefficient (-14).
Square it (196) and add it to both sides.

Add '196' to each side of the equation.
-28w + 196 + w2 = -91 + 196

Reorder the terms:
196 + -28w + w2 = -91 + 196

Combine like terms: -91 + 196 = 105
196 + -28w + w2 = 105

Factor a perfect square on the left side:
(w + -14)(w + -14) = 105

Calculate the square root of the right side: 10.246950766

Break this problem into two subproblems by setting 
(w + -14) equal to 10.246950766 and -10.246950766.

Subproblem 1

w + -14 = 10.246950766 Simplifying w + -14 = 10.246950766 Reorder the terms: -14 + w = 10.246950766 Solving -14 + w = 10.246950766 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + w = 10.246950766 + 14 Combine like terms: -14 + 14 = 0 0 + w = 10.246950766 + 14 w = 10.246950766 + 14 Combine like terms: 10.246950766 + 14 = 24.246950766 w = 24.246950766 Simplifying w = 24.246950766

Subproblem 2

w + -14 = -10.246950766 Simplifying w + -14 = -10.246950766 Reorder the terms: -14 + w = -10.246950766 Solving -14 + w = -10.246950766 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + w = -10.246950766 + 14 Combine like terms: -14 + 14 = 0 0 + w = -10.246950766 + 14 w = -10.246950766 + 14 Combine like terms: -10.246950766 + 14 = 3.753049234 w = 3.753049234 Simplifying w = 3.753049234

Solution

The solution to the problem is based on the solutions from the subproblems. w = {24.246950766, 3.753049234}

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