8w^2+15w-26=0

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Solution for 8w^2+15w-26=0 equation:


Simplifying
8w2 + 15w + -26 = 0

Reorder the terms:
-26 + 15w + 8w2 = 0

Solving
-26 + 15w + 8w2 = 0

Solving for variable 'w'.

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

Divide each side by '8'.
-3.25 + 1.875w + w2 = 0

Move the constant term to the right:

Add '3.25' to each side of the equation.
-3.25 + 1.875w + 3.25 + w2 = 0 + 3.25

Reorder the terms:
-3.25 + 3.25 + 1.875w + w2 = 0 + 3.25

Combine like terms: -3.25 + 3.25 = 0.00
0.00 + 1.875w + w2 = 0 + 3.25
1.875w + w2 = 0 + 3.25

Combine like terms: 0 + 3.25 = 3.25
1.875w + w2 = 3.25

The w term is 1.875w.  Take half its coefficient (0.9375).
Square it (0.87890625) and add it to both sides.

Add '0.87890625' to each side of the equation.
1.875w + 0.87890625 + w2 = 3.25 + 0.87890625

Reorder the terms:
0.87890625 + 1.875w + w2 = 3.25 + 0.87890625

Combine like terms: 3.25 + 0.87890625 = 4.12890625
0.87890625 + 1.875w + w2 = 4.12890625

Factor a perfect square on the left side:
(w + 0.9375)(w + 0.9375) = 4.12890625

Calculate the square root of the right side: 2.031971026

Break this problem into two subproblems by setting 
(w + 0.9375) equal to 2.031971026 and -2.031971026.

Subproblem 1

w + 0.9375 = 2.031971026 Simplifying w + 0.9375 = 2.031971026 Reorder the terms: 0.9375 + w = 2.031971026 Solving 0.9375 + w = 2.031971026 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-0.9375' to each side of the equation. 0.9375 + -0.9375 + w = 2.031971026 + -0.9375 Combine like terms: 0.9375 + -0.9375 = 0.0000 0.0000 + w = 2.031971026 + -0.9375 w = 2.031971026 + -0.9375 Combine like terms: 2.031971026 + -0.9375 = 1.094471026 w = 1.094471026 Simplifying w = 1.094471026

Subproblem 2

w + 0.9375 = -2.031971026 Simplifying w + 0.9375 = -2.031971026 Reorder the terms: 0.9375 + w = -2.031971026 Solving 0.9375 + w = -2.031971026 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-0.9375' to each side of the equation. 0.9375 + -0.9375 + w = -2.031971026 + -0.9375 Combine like terms: 0.9375 + -0.9375 = 0.0000 0.0000 + w = -2.031971026 + -0.9375 w = -2.031971026 + -0.9375 Combine like terms: -2.031971026 + -0.9375 = -2.969471026 w = -2.969471026 Simplifying w = -2.969471026

Solution

The solution to the problem is based on the solutions from the subproblems. w = {1.094471026, -2.969471026}

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