w^2+8w=100

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Solution for w^2+8w=100 equation:


Simplifying
w2 + 8w = 100

Reorder the terms:
8w + w2 = 100

Solving
8w + w2 = 100

Solving for variable 'w'.

Reorder the terms:
-100 + 8w + w2 = 100 + -100

Combine like terms: 100 + -100 = 0
-100 + 8w + w2 = 0

Begin completing the square.

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + 8w + 100 + w2 = 0 + 100

Reorder the terms:
-100 + 100 + 8w + w2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + 8w + w2 = 0 + 100
8w + w2 = 0 + 100

Combine like terms: 0 + 100 = 100
8w + w2 = 100

The w term is 8w.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8w + 16 + w2 = 100 + 16

Reorder the terms:
16 + 8w + w2 = 100 + 16

Combine like terms: 100 + 16 = 116
16 + 8w + w2 = 116

Factor a perfect square on the left side:
(w + 4)(w + 4) = 116

Calculate the square root of the right side: 10.770329614

Break this problem into two subproblems by setting 
(w + 4) equal to 10.770329614 and -10.770329614.

Subproblem 1

w + 4 = 10.770329614 Simplifying w + 4 = 10.770329614 Reorder the terms: 4 + w = 10.770329614 Solving 4 + w = 10.770329614 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + w = 10.770329614 + -4 Combine like terms: 4 + -4 = 0 0 + w = 10.770329614 + -4 w = 10.770329614 + -4 Combine like terms: 10.770329614 + -4 = 6.770329614 w = 6.770329614 Simplifying w = 6.770329614

Subproblem 2

w + 4 = -10.770329614 Simplifying w + 4 = -10.770329614 Reorder the terms: 4 + w = -10.770329614 Solving 4 + w = -10.770329614 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + w = -10.770329614 + -4 Combine like terms: 4 + -4 = 0 0 + w = -10.770329614 + -4 w = -10.770329614 + -4 Combine like terms: -10.770329614 + -4 = -14.770329614 w = -14.770329614 Simplifying w = -14.770329614

Solution

The solution to the problem is based on the solutions from the subproblems. w = {6.770329614, -14.770329614}

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