5w^2-3w-20=0

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Solution for 5w^2-3w-20=0 equation:


Simplifying
5w2 + -3w + -20 = 0

Reorder the terms:
-20 + -3w + 5w2 = 0

Solving
-20 + -3w + 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 + -0.6w + w2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -0.6w + 4 + w2 = 0 + 4

Reorder the terms:
-4 + 4 + -0.6w + w2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -0.6w + w2 = 0 + 4
-0.6w + w2 = 0 + 4

Combine like terms: 0 + 4 = 4
-0.6w + w2 = 4

The w term is -0.6w.  Take half its coefficient (-0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
-0.6w + 0.09 + w2 = 4 + 0.09

Reorder the terms:
0.09 + -0.6w + w2 = 4 + 0.09

Combine like terms: 4 + 0.09 = 4.09
0.09 + -0.6w + w2 = 4.09

Factor a perfect square on the left side:
(w + -0.3)(w + -0.3) = 4.09

Calculate the square root of the right side: 2.022374842

Break this problem into two subproblems by setting 
(w + -0.3) equal to 2.022374842 and -2.022374842.

Subproblem 1

w + -0.3 = 2.022374842 Simplifying w + -0.3 = 2.022374842 Reorder the terms: -0.3 + w = 2.022374842 Solving -0.3 + w = 2.022374842 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + w = 2.022374842 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + w = 2.022374842 + 0.3 w = 2.022374842 + 0.3 Combine like terms: 2.022374842 + 0.3 = 2.322374842 w = 2.322374842 Simplifying w = 2.322374842

Subproblem 2

w + -0.3 = -2.022374842 Simplifying w + -0.3 = -2.022374842 Reorder the terms: -0.3 + w = -2.022374842 Solving -0.3 + w = -2.022374842 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + w = -2.022374842 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + w = -2.022374842 + 0.3 w = -2.022374842 + 0.3 Combine like terms: -2.022374842 + 0.3 = -1.722374842 w = -1.722374842 Simplifying w = -1.722374842

Solution

The solution to the problem is based on the solutions from the subproblems. w = {2.322374842, -1.722374842}

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