2w^2+5w-55=0

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Solution for 2w^2+5w-55=0 equation:


Simplifying
2w2 + 5w + -55 = 0

Reorder the terms:
-55 + 5w + 2w2 = 0

Solving
-55 + 5w + 2w2 = 0

Solving for variable 'w'.

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

Divide each side by '2'.
-27.5 + 2.5w + w2 = 0

Move the constant term to the right:

Add '27.5' to each side of the equation.
-27.5 + 2.5w + 27.5 + w2 = 0 + 27.5

Reorder the terms:
-27.5 + 27.5 + 2.5w + w2 = 0 + 27.5

Combine like terms: -27.5 + 27.5 = 0.0
0.0 + 2.5w + w2 = 0 + 27.5
2.5w + w2 = 0 + 27.5

Combine like terms: 0 + 27.5 = 27.5
2.5w + w2 = 27.5

The w term is 2.5w.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5w + 1.5625 + w2 = 27.5 + 1.5625

Reorder the terms:
1.5625 + 2.5w + w2 = 27.5 + 1.5625

Combine like terms: 27.5 + 1.5625 = 29.0625
1.5625 + 2.5w + w2 = 29.0625

Factor a perfect square on the left side:
(w + 1.25)(w + 1.25) = 29.0625

Calculate the square root of the right side: 5.390964663

Break this problem into two subproblems by setting 
(w + 1.25) equal to 5.390964663 and -5.390964663.

Subproblem 1

w + 1.25 = 5.390964663 Simplifying w + 1.25 = 5.390964663 Reorder the terms: 1.25 + w = 5.390964663 Solving 1.25 + w = 5.390964663 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + w = 5.390964663 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + w = 5.390964663 + -1.25 w = 5.390964663 + -1.25 Combine like terms: 5.390964663 + -1.25 = 4.140964663 w = 4.140964663 Simplifying w = 4.140964663

Subproblem 2

w + 1.25 = -5.390964663 Simplifying w + 1.25 = -5.390964663 Reorder the terms: 1.25 + w = -5.390964663 Solving 1.25 + w = -5.390964663 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + w = -5.390964663 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + w = -5.390964663 + -1.25 w = -5.390964663 + -1.25 Combine like terms: -5.390964663 + -1.25 = -6.640964663 w = -6.640964663 Simplifying w = -6.640964663

Solution

The solution to the problem is based on the solutions from the subproblems. w = {4.140964663, -6.640964663}

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