500=2.5w^2-4w

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Solution for 500=2.5w^2-4w equation:


Simplifying
500 = 2.5w2 + -4w

Reorder the terms:
500 = -4w + 2.5w2

Solving
500 = -4w + 2.5w2

Solving for variable 'w'.

Reorder the terms:
500 + 4w + -2.5w2 = -4w + 4w + 2.5w2 + -2.5w2

Combine like terms: -4w + 4w = 0
500 + 4w + -2.5w2 = 0 + 2.5w2 + -2.5w2
500 + 4w + -2.5w2 = 2.5w2 + -2.5w2

Combine like terms: 2.5w2 + -2.5w2 = 0.0
500 + 4w + -2.5w2 = 0.0

Begin completing the square.  Divide all terms by
-2.5 the coefficient of the squared term: 

Divide each side by '-2.5'.
-200 + -1.6w + w2 = 0

Move the constant term to the right:

Add '200' to each side of the equation.
-200 + -1.6w + 200 + w2 = 0 + 200

Reorder the terms:
-200 + 200 + -1.6w + w2 = 0 + 200

Combine like terms: -200 + 200 = 0
0 + -1.6w + w2 = 0 + 200
-1.6w + w2 = 0 + 200

Combine like terms: 0 + 200 = 200
-1.6w + w2 = 200

The w term is -1.6w.  Take half its coefficient (-0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
-1.6w + 0.64 + w2 = 200 + 0.64

Reorder the terms:
0.64 + -1.6w + w2 = 200 + 0.64

Combine like terms: 200 + 0.64 = 200.64
0.64 + -1.6w + w2 = 200.64

Factor a perfect square on the left side:
(w + -0.8)(w + -0.8) = 200.64

Calculate the square root of the right side: 14.164744968

Break this problem into two subproblems by setting 
(w + -0.8) equal to 14.164744968 and -14.164744968.

Subproblem 1

w + -0.8 = 14.164744968 Simplifying w + -0.8 = 14.164744968 Reorder the terms: -0.8 + w = 14.164744968 Solving -0.8 + w = 14.164744968 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + w = 14.164744968 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + w = 14.164744968 + 0.8 w = 14.164744968 + 0.8 Combine like terms: 14.164744968 + 0.8 = 14.964744968 w = 14.964744968 Simplifying w = 14.964744968

Subproblem 2

w + -0.8 = -14.164744968 Simplifying w + -0.8 = -14.164744968 Reorder the terms: -0.8 + w = -14.164744968 Solving -0.8 + w = -14.164744968 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + w = -14.164744968 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + w = -14.164744968 + 0.8 w = -14.164744968 + 0.8 Combine like terms: -14.164744968 + 0.8 = -13.364744968 w = -13.364744968 Simplifying w = -13.364744968

Solution

The solution to the problem is based on the solutions from the subproblems. w = {14.964744968, -13.364744968}

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