2w^2-5w-28=0

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Solution for 2w^2-5w-28=0 equation:


Simplifying
2w2 + -5w + -28 = 0

Reorder the terms:
-28 + -5w + 2w2 = 0

Solving
-28 + -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'.
-14 + -2.5w + w2 = 0

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + -2.5w + 14 + w2 = 0 + 14

Reorder the terms:
-14 + 14 + -2.5w + w2 = 0 + 14

Combine like terms: -14 + 14 = 0
0 + -2.5w + w2 = 0 + 14
-2.5w + w2 = 0 + 14

Combine like terms: 0 + 14 = 14
-2.5w + w2 = 14

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 = 14 + 1.5625

Reorder the terms:
1.5625 + -2.5w + w2 = 14 + 1.5625

Combine like terms: 14 + 1.5625 = 15.5625
1.5625 + -2.5w + w2 = 15.5625

Factor a perfect square on the left side:
(w + -1.25)(w + -1.25) = 15.5625

Calculate the square root of the right side: 3.94493346

Break this problem into two subproblems by setting 
(w + -1.25) equal to 3.94493346 and -3.94493346.

Subproblem 1

w + -1.25 = 3.94493346 Simplifying w + -1.25 = 3.94493346 Reorder the terms: -1.25 + w = 3.94493346 Solving -1.25 + w = 3.94493346 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 = 3.94493346 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + w = 3.94493346 + 1.25 w = 3.94493346 + 1.25 Combine like terms: 3.94493346 + 1.25 = 5.19493346 w = 5.19493346 Simplifying w = 5.19493346

Subproblem 2

w + -1.25 = -3.94493346 Simplifying w + -1.25 = -3.94493346 Reorder the terms: -1.25 + w = -3.94493346 Solving -1.25 + w = -3.94493346 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 = -3.94493346 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + w = -3.94493346 + 1.25 w = -3.94493346 + 1.25 Combine like terms: -3.94493346 + 1.25 = -2.69493346 w = -2.69493346 Simplifying w = -2.69493346

Solution

The solution to the problem is based on the solutions from the subproblems. w = {5.19493346, -2.69493346}

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