2w^2+9w-8=0

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Solution for 2w^2+9w-8=0 equation:


Simplifying
2w2 + 9w + -8 = 0

Reorder the terms:
-8 + 9w + 2w2 = 0

Solving
-8 + 9w + 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'.
-4 + 4.5w + w2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 4.5w + 4 + w2 = 0 + 4

Reorder the terms:
-4 + 4 + 4.5w + w2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 4.5w + w2 = 0 + 4
4.5w + w2 = 0 + 4

Combine like terms: 0 + 4 = 4
4.5w + w2 = 4

The w term is 4.5w.  Take half its coefficient (2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
4.5w + 5.0625 + w2 = 4 + 5.0625

Reorder the terms:
5.0625 + 4.5w + w2 = 4 + 5.0625

Combine like terms: 4 + 5.0625 = 9.0625
5.0625 + 4.5w + w2 = 9.0625

Factor a perfect square on the left side:
(w + 2.25)(w + 2.25) = 9.0625

Calculate the square root of the right side: 3.010398645

Break this problem into two subproblems by setting 
(w + 2.25) equal to 3.010398645 and -3.010398645.

Subproblem 1

w + 2.25 = 3.010398645 Simplifying w + 2.25 = 3.010398645 Reorder the terms: 2.25 + w = 3.010398645 Solving 2.25 + w = 3.010398645 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + w = 3.010398645 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + w = 3.010398645 + -2.25 w = 3.010398645 + -2.25 Combine like terms: 3.010398645 + -2.25 = 0.760398645 w = 0.760398645 Simplifying w = 0.760398645

Subproblem 2

w + 2.25 = -3.010398645 Simplifying w + 2.25 = -3.010398645 Reorder the terms: 2.25 + w = -3.010398645 Solving 2.25 + w = -3.010398645 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + w = -3.010398645 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + w = -3.010398645 + -2.25 w = -3.010398645 + -2.25 Combine like terms: -3.010398645 + -2.25 = -5.260398645 w = -5.260398645 Simplifying w = -5.260398645

Solution

The solution to the problem is based on the solutions from the subproblems. w = {0.760398645, -5.260398645}

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