w^2-4w-156=0

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Solution for w^2-4w-156=0 equation:


Simplifying
w2 + -4w + -156 = 0

Reorder the terms:
-156 + -4w + w2 = 0

Solving
-156 + -4w + w2 = 0

Solving for variable 'w'.

Begin completing the square.

Move the constant term to the right:

Add '156' to each side of the equation.
-156 + -4w + 156 + w2 = 0 + 156

Reorder the terms:
-156 + 156 + -4w + w2 = 0 + 156

Combine like terms: -156 + 156 = 0
0 + -4w + w2 = 0 + 156
-4w + w2 = 0 + 156

Combine like terms: 0 + 156 = 156
-4w + w2 = 156

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 = 156 + 4

Reorder the terms:
4 + -4w + w2 = 156 + 4

Combine like terms: 156 + 4 = 160
4 + -4w + w2 = 160

Factor a perfect square on the left side:
(w + -2)(w + -2) = 160

Calculate the square root of the right side: 12.649110641

Break this problem into two subproblems by setting 
(w + -2) equal to 12.649110641 and -12.649110641.

Subproblem 1

w + -2 = 12.649110641 Simplifying w + -2 = 12.649110641 Reorder the terms: -2 + w = 12.649110641 Solving -2 + w = 12.649110641 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 = 12.649110641 + 2 Combine like terms: -2 + 2 = 0 0 + w = 12.649110641 + 2 w = 12.649110641 + 2 Combine like terms: 12.649110641 + 2 = 14.649110641 w = 14.649110641 Simplifying w = 14.649110641

Subproblem 2

w + -2 = -12.649110641 Simplifying w + -2 = -12.649110641 Reorder the terms: -2 + w = -12.649110641 Solving -2 + w = -12.649110641 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 = -12.649110641 + 2 Combine like terms: -2 + 2 = 0 0 + w = -12.649110641 + 2 w = -12.649110641 + 2 Combine like terms: -12.649110641 + 2 = -10.649110641 w = -10.649110641 Simplifying w = -10.649110641

Solution

The solution to the problem is based on the solutions from the subproblems. w = {14.649110641, -10.649110641}

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