2w^2-5w-122=0

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Solution for 2w^2-5w-122=0 equation:


Simplifying
2w2 + -5w + -122 = 0

Reorder the terms:
-122 + -5w + 2w2 = 0

Solving
-122 + -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'.
-61 + -2.5w + w2 = 0

Move the constant term to the right:

Add '61' to each side of the equation.
-61 + -2.5w + 61 + w2 = 0 + 61

Reorder the terms:
-61 + 61 + -2.5w + w2 = 0 + 61

Combine like terms: -61 + 61 = 0
0 + -2.5w + w2 = 0 + 61
-2.5w + w2 = 0 + 61

Combine like terms: 0 + 61 = 61
-2.5w + w2 = 61

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 = 61 + 1.5625

Reorder the terms:
1.5625 + -2.5w + w2 = 61 + 1.5625

Combine like terms: 61 + 1.5625 = 62.5625
1.5625 + -2.5w + w2 = 62.5625

Factor a perfect square on the left side:
(w + -1.25)(w + -1.25) = 62.5625

Calculate the square root of the right side: 7.90964601

Break this problem into two subproblems by setting 
(w + -1.25) equal to 7.90964601 and -7.90964601.

Subproblem 1

w + -1.25 = 7.90964601 Simplifying w + -1.25 = 7.90964601 Reorder the terms: -1.25 + w = 7.90964601 Solving -1.25 + w = 7.90964601 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 = 7.90964601 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + w = 7.90964601 + 1.25 w = 7.90964601 + 1.25 Combine like terms: 7.90964601 + 1.25 = 9.15964601 w = 9.15964601 Simplifying w = 9.15964601

Subproblem 2

w + -1.25 = -7.90964601 Simplifying w + -1.25 = -7.90964601 Reorder the terms: -1.25 + w = -7.90964601 Solving -1.25 + w = -7.90964601 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 = -7.90964601 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + w = -7.90964601 + 1.25 w = -7.90964601 + 1.25 Combine like terms: -7.90964601 + 1.25 = -6.65964601 w = -6.65964601 Simplifying w = -6.65964601

Solution

The solution to the problem is based on the solutions from the subproblems. w = {9.15964601, -6.65964601}

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