7(w+20)w=5

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Solution for 7(w+20)w=5 equation:


Simplifying
7(w + 20) * w = 5

Reorder the terms:
7(20 + w) * w = 5

Reorder the terms for easier multiplication:
7w(20 + w) = 5
(20 * 7w + w * 7w) = 5
(140w + 7w2) = 5

Solving
140w + 7w2 = 5

Solving for variable 'w'.

Reorder the terms:
-5 + 140w + 7w2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + 140w + 7w2 = 0

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

Divide each side by '7'.
-0.7142857143 + 20w + w2 = 0

Move the constant term to the right:

Add '0.7142857143' to each side of the equation.
-0.7142857143 + 20w + 0.7142857143 + w2 = 0 + 0.7142857143

Reorder the terms:
-0.7142857143 + 0.7142857143 + 20w + w2 = 0 + 0.7142857143

Combine like terms: -0.7142857143 + 0.7142857143 = 0.0000000000
0.0000000000 + 20w + w2 = 0 + 0.7142857143
20w + w2 = 0 + 0.7142857143

Combine like terms: 0 + 0.7142857143 = 0.7142857143
20w + w2 = 0.7142857143

The w term is 20w.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20w + 100 + w2 = 0.7142857143 + 100

Reorder the terms:
100 + 20w + w2 = 0.7142857143 + 100

Combine like terms: 0.7142857143 + 100 = 100.7142857143
100 + 20w + w2 = 100.7142857143

Factor a perfect square on the left side:
(w + 10)(w + 10) = 100.7142857143

Calculate the square root of the right side: 10.035650737

Break this problem into two subproblems by setting 
(w + 10) equal to 10.035650737 and -10.035650737.

Subproblem 1

w + 10 = 10.035650737 Simplifying w + 10 = 10.035650737 Reorder the terms: 10 + w = 10.035650737 Solving 10 + w = 10.035650737 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + w = 10.035650737 + -10 Combine like terms: 10 + -10 = 0 0 + w = 10.035650737 + -10 w = 10.035650737 + -10 Combine like terms: 10.035650737 + -10 = 0.035650737 w = 0.035650737 Simplifying w = 0.035650737

Subproblem 2

w + 10 = -10.035650737 Simplifying w + 10 = -10.035650737 Reorder the terms: 10 + w = -10.035650737 Solving 10 + w = -10.035650737 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + w = -10.035650737 + -10 Combine like terms: 10 + -10 = 0 0 + w = -10.035650737 + -10 w = -10.035650737 + -10 Combine like terms: -10.035650737 + -10 = -20.035650737 w = -20.035650737 Simplifying w = -20.035650737

Solution

The solution to the problem is based on the solutions from the subproblems. w = {0.035650737, -20.035650737}

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