5w^2-19w-20=

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Solution for 5w^2-19w-20= equation:


Simplifying
5w2 + -19w + -20 = 0

Reorder the terms:
-20 + -19w + 5w2 = 0

Solving
-20 + -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'.
-4 + -3.8w + w2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -3.8w + 4 + w2 = 0 + 4

Reorder the terms:
-4 + 4 + -3.8w + w2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -3.8w + w2 = 0 + 4
-3.8w + w2 = 0 + 4

Combine like terms: 0 + 4 = 4
-3.8w + w2 = 4

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 = 4 + 3.61

Reorder the terms:
3.61 + -3.8w + w2 = 4 + 3.61

Combine like terms: 4 + 3.61 = 7.61
3.61 + -3.8w + w2 = 7.61

Factor a perfect square on the left side:
(w + -1.9)(w + -1.9) = 7.61

Calculate the square root of the right side: 2.758622845

Break this problem into two subproblems by setting 
(w + -1.9) equal to 2.758622845 and -2.758622845.

Subproblem 1

w + -1.9 = 2.758622845 Simplifying w + -1.9 = 2.758622845 Reorder the terms: -1.9 + w = 2.758622845 Solving -1.9 + w = 2.758622845 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 = 2.758622845 + 1.9 Combine like terms: -1.9 + 1.9 = 0.0 0.0 + w = 2.758622845 + 1.9 w = 2.758622845 + 1.9 Combine like terms: 2.758622845 + 1.9 = 4.658622845 w = 4.658622845 Simplifying w = 4.658622845

Subproblem 2

w + -1.9 = -2.758622845 Simplifying w + -1.9 = -2.758622845 Reorder the terms: -1.9 + w = -2.758622845 Solving -1.9 + w = -2.758622845 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 = -2.758622845 + 1.9 Combine like terms: -1.9 + 1.9 = 0.0 0.0 + w = -2.758622845 + 1.9 w = -2.758622845 + 1.9 Combine like terms: -2.758622845 + 1.9 = -0.858622845 w = -0.858622845 Simplifying w = -0.858622845

Solution

The solution to the problem is based on the solutions from the subproblems. w = {4.658622845, -0.858622845}

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