0=2w^2+w-5

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


Simplifying
0 = 2w2 + w + -5

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

Solving
0 = -5 + w + 2w2

Solving for variable 'w'.

Combine like terms: 0 + 5 = 5
5 + -1w + -2w2 = -5 + w + 2w2 + 5 + -1w + -2w2

Reorder the terms:
5 + -1w + -2w2 = -5 + 5 + w + -1w + 2w2 + -2w2

Combine like terms: -5 + 5 = 0
5 + -1w + -2w2 = 0 + w + -1w + 2w2 + -2w2
5 + -1w + -2w2 = w + -1w + 2w2 + -2w2

Combine like terms: w + -1w = 0
5 + -1w + -2w2 = 0 + 2w2 + -2w2
5 + -1w + -2w2 = 2w2 + -2w2

Combine like terms: 2w2 + -2w2 = 0
5 + -1w + -2w2 = 0

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

Divide each side by '-2'.
-2.5 + 0.5w + w2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + 0.5w + 2.5 + w2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + 0.5w + w2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + 0.5w + w2 = 0 + 2.5
0.5w + w2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
0.5w + w2 = 2.5

The w term is 0.5w.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5w + 0.0625 + w2 = 2.5 + 0.0625

Reorder the terms:
0.0625 + 0.5w + w2 = 2.5 + 0.0625

Combine like terms: 2.5 + 0.0625 = 2.5625
0.0625 + 0.5w + w2 = 2.5625

Factor a perfect square on the left side:
(w + 0.25)(w + 0.25) = 2.5625

Calculate the square root of the right side: 1.600781059

Break this problem into two subproblems by setting 
(w + 0.25) equal to 1.600781059 and -1.600781059.

Subproblem 1

w + 0.25 = 1.600781059 Simplifying w + 0.25 = 1.600781059 Reorder the terms: 0.25 + w = 1.600781059 Solving 0.25 + w = 1.600781059 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + w = 1.600781059 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + w = 1.600781059 + -0.25 w = 1.600781059 + -0.25 Combine like terms: 1.600781059 + -0.25 = 1.350781059 w = 1.350781059 Simplifying w = 1.350781059

Subproblem 2

w + 0.25 = -1.600781059 Simplifying w + 0.25 = -1.600781059 Reorder the terms: 0.25 + w = -1.600781059 Solving 0.25 + w = -1.600781059 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + w = -1.600781059 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + w = -1.600781059 + -0.25 w = -1.600781059 + -0.25 Combine like terms: -1.600781059 + -0.25 = -1.850781059 w = -1.850781059 Simplifying w = -1.850781059

Solution

The solution to the problem is based on the solutions from the subproblems. w = {1.350781059, -1.850781059}

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