w^2+15w-64=0

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Solution for w^2+15w-64=0 equation:


Simplifying
w2 + 15w + -64 = 0

Reorder the terms:
-64 + 15w + w2 = 0

Solving
-64 + 15w + w2 = 0

Solving for variable 'w'.

Begin completing the square.

Move the constant term to the right:

Add '64' to each side of the equation.
-64 + 15w + 64 + w2 = 0 + 64

Reorder the terms:
-64 + 64 + 15w + w2 = 0 + 64

Combine like terms: -64 + 64 = 0
0 + 15w + w2 = 0 + 64
15w + w2 = 0 + 64

Combine like terms: 0 + 64 = 64
15w + w2 = 64

The w term is 15w.  Take half its coefficient (7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
15w + 56.25 + w2 = 64 + 56.25

Reorder the terms:
56.25 + 15w + w2 = 64 + 56.25

Combine like terms: 64 + 56.25 = 120.25
56.25 + 15w + w2 = 120.25

Factor a perfect square on the left side:
(w + 7.5)(w + 7.5) = 120.25

Calculate the square root of the right side: 10.9658561

Break this problem into two subproblems by setting 
(w + 7.5) equal to 10.9658561 and -10.9658561.

Subproblem 1

w + 7.5 = 10.9658561 Simplifying w + 7.5 = 10.9658561 Reorder the terms: 7.5 + w = 10.9658561 Solving 7.5 + w = 10.9658561 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + w = 10.9658561 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + w = 10.9658561 + -7.5 w = 10.9658561 + -7.5 Combine like terms: 10.9658561 + -7.5 = 3.4658561 w = 3.4658561 Simplifying w = 3.4658561

Subproblem 2

w + 7.5 = -10.9658561 Simplifying w + 7.5 = -10.9658561 Reorder the terms: 7.5 + w = -10.9658561 Solving 7.5 + w = -10.9658561 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + w = -10.9658561 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + w = -10.9658561 + -7.5 w = -10.9658561 + -7.5 Combine like terms: -10.9658561 + -7.5 = -18.4658561 w = -18.4658561 Simplifying w = -18.4658561

Solution

The solution to the problem is based on the solutions from the subproblems. w = {3.4658561, -18.4658561}

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