w^2+4w=800

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Solution for w^2+4w=800 equation:


Simplifying
w2 + 4w = 800

Reorder the terms:
4w + w2 = 800

Solving
4w + w2 = 800

Solving for variable 'w'.

Reorder the terms:
-800 + 4w + w2 = 800 + -800

Combine like terms: 800 + -800 = 0
-800 + 4w + w2 = 0

Begin completing the square.

Move the constant term to the right:

Add '800' to each side of the equation.
-800 + 4w + 800 + w2 = 0 + 800

Reorder the terms:
-800 + 800 + 4w + w2 = 0 + 800

Combine like terms: -800 + 800 = 0
0 + 4w + w2 = 0 + 800
4w + w2 = 0 + 800

Combine like terms: 0 + 800 = 800
4w + w2 = 800

The w term is 4w.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4w + 4 + w2 = 800 + 4

Reorder the terms:
4 + 4w + w2 = 800 + 4

Combine like terms: 800 + 4 = 804
4 + 4w + w2 = 804

Factor a perfect square on the left side:
(w + 2)(w + 2) = 804

Calculate the square root of the right side: 28.354893758

Break this problem into two subproblems by setting 
(w + 2) equal to 28.354893758 and -28.354893758.

Subproblem 1

w + 2 = 28.354893758 Simplifying w + 2 = 28.354893758 Reorder the terms: 2 + w = 28.354893758 Solving 2 + w = 28.354893758 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + w = 28.354893758 + -2 Combine like terms: 2 + -2 = 0 0 + w = 28.354893758 + -2 w = 28.354893758 + -2 Combine like terms: 28.354893758 + -2 = 26.354893758 w = 26.354893758 Simplifying w = 26.354893758

Subproblem 2

w + 2 = -28.354893758 Simplifying w + 2 = -28.354893758 Reorder the terms: 2 + w = -28.354893758 Solving 2 + w = -28.354893758 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + w = -28.354893758 + -2 Combine like terms: 2 + -2 = 0 0 + w = -28.354893758 + -2 w = -28.354893758 + -2 Combine like terms: -28.354893758 + -2 = -30.354893758 w = -30.354893758 Simplifying w = -30.354893758

Solution

The solution to the problem is based on the solutions from the subproblems. w = {26.354893758, -30.354893758}

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