5w^2-19w-80=0

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Solution for 5w^2-19w-80=0 equation:


Simplifying
5w2 + -19w + -80 = 0

Reorder the terms:
-80 + -19w + 5w2 = 0

Solving
-80 + -19w + 5w2 = 0

Solving for variable 'w'.

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

Divide each side by '5'.
-16 + -3.8w + w2 = 0

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + -3.8w + 16 + w2 = 0 + 16

Reorder the terms:
-16 + 16 + -3.8w + w2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + -3.8w + w2 = 0 + 16
-3.8w + w2 = 0 + 16

Combine like terms: 0 + 16 = 16
-3.8w + w2 = 16

The w term is -3.8w.  Take half its coefficient (-1.9).
Square it (3.61) and add it to both sides.

Add '3.61' to each side of the equation.
-3.8w + 3.61 + w2 = 16 + 3.61

Reorder the terms:
3.61 + -3.8w + w2 = 16 + 3.61

Combine like terms: 16 + 3.61 = 19.61
3.61 + -3.8w + w2 = 19.61

Factor a perfect square on the left side:
(w + -1.9)(w + -1.9) = 19.61

Calculate the square root of the right side: 4.428317965

Break this problem into two subproblems by setting 
(w + -1.9) equal to 4.428317965 and -4.428317965.

Subproblem 1

w + -1.9 = 4.428317965 Simplifying w + -1.9 = 4.428317965 Reorder the terms: -1.9 + w = 4.428317965 Solving -1.9 + w = 4.428317965 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '1.9' to each side of the equation. -1.9 + 1.9 + w = 4.428317965 + 1.9 Combine like terms: -1.9 + 1.9 = 0.0 0.0 + w = 4.428317965 + 1.9 w = 4.428317965 + 1.9 Combine like terms: 4.428317965 + 1.9 = 6.328317965 w = 6.328317965 Simplifying w = 6.328317965

Subproblem 2

w + -1.9 = -4.428317965 Simplifying w + -1.9 = -4.428317965 Reorder the terms: -1.9 + w = -4.428317965 Solving -1.9 + w = -4.428317965 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '1.9' to each side of the equation. -1.9 + 1.9 + w = -4.428317965 + 1.9 Combine like terms: -1.9 + 1.9 = 0.0 0.0 + w = -4.428317965 + 1.9 w = -4.428317965 + 1.9 Combine like terms: -4.428317965 + 1.9 = -2.528317965 w = -2.528317965 Simplifying w = -2.528317965

Solution

The solution to the problem is based on the solutions from the subproblems. w = {6.328317965, -2.528317965}

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