w^2=8w+72

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Solution for w^2=8w+72 equation:


Simplifying
w2 = 8w + 72

Reorder the terms:
w2 = 72 + 8w

Solving
w2 = 72 + 8w

Solving for variable 'w'.

Reorder the terms:
-72 + -8w + w2 = 72 + 8w + -72 + -8w

Reorder the terms:
-72 + -8w + w2 = 72 + -72 + 8w + -8w

Combine like terms: 72 + -72 = 0
-72 + -8w + w2 = 0 + 8w + -8w
-72 + -8w + w2 = 8w + -8w

Combine like terms: 8w + -8w = 0
-72 + -8w + w2 = 0

Begin completing the square.

Move the constant term to the right:

Add '72' to each side of the equation.
-72 + -8w + 72 + w2 = 0 + 72

Reorder the terms:
-72 + 72 + -8w + w2 = 0 + 72

Combine like terms: -72 + 72 = 0
0 + -8w + w2 = 0 + 72
-8w + w2 = 0 + 72

Combine like terms: 0 + 72 = 72
-8w + w2 = 72

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 = 72 + 16

Reorder the terms:
16 + -8w + w2 = 72 + 16

Combine like terms: 72 + 16 = 88
16 + -8w + w2 = 88

Factor a perfect square on the left side:
(w + -4)(w + -4) = 88

Calculate the square root of the right side: 9.38083152

Break this problem into two subproblems by setting 
(w + -4) equal to 9.38083152 and -9.38083152.

Subproblem 1

w + -4 = 9.38083152 Simplifying w + -4 = 9.38083152 Reorder the terms: -4 + w = 9.38083152 Solving -4 + w = 9.38083152 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 = 9.38083152 + 4 Combine like terms: -4 + 4 = 0 0 + w = 9.38083152 + 4 w = 9.38083152 + 4 Combine like terms: 9.38083152 + 4 = 13.38083152 w = 13.38083152 Simplifying w = 13.38083152

Subproblem 2

w + -4 = -9.38083152 Simplifying w + -4 = -9.38083152 Reorder the terms: -4 + w = -9.38083152 Solving -4 + w = -9.38083152 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 = -9.38083152 + 4 Combine like terms: -4 + 4 = 0 0 + w = -9.38083152 + 4 w = -9.38083152 + 4 Combine like terms: -9.38083152 + 4 = -5.38083152 w = -5.38083152 Simplifying w = -5.38083152

Solution

The solution to the problem is based on the solutions from the subproblems. w = {13.38083152, -5.38083152}

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