w^2+5w-72=0

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Solution for w^2+5w-72=0 equation:


Simplifying
w2 + 5w + -72 = 0

Reorder the terms:
-72 + 5w + w2 = 0

Solving
-72 + 5w + w2 = 0

Solving for variable 'w'.

Begin completing the square.

Move the constant term to the right:

Add '72' to each side of the equation.
-72 + 5w + 72 + w2 = 0 + 72

Reorder the terms:
-72 + 72 + 5w + w2 = 0 + 72

Combine like terms: -72 + 72 = 0
0 + 5w + w2 = 0 + 72
5w + w2 = 0 + 72

Combine like terms: 0 + 72 = 72
5w + w2 = 72

The w term is 5w.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5w + 6.25 + w2 = 72 + 6.25

Reorder the terms:
6.25 + 5w + w2 = 72 + 6.25

Combine like terms: 72 + 6.25 = 78.25
6.25 + 5w + w2 = 78.25

Factor a perfect square on the left side:
(w + 2.5)(w + 2.5) = 78.25

Calculate the square root of the right side: 8.845903006

Break this problem into two subproblems by setting 
(w + 2.5) equal to 8.845903006 and -8.845903006.

Subproblem 1

w + 2.5 = 8.845903006 Simplifying w + 2.5 = 8.845903006 Reorder the terms: 2.5 + w = 8.845903006 Solving 2.5 + w = 8.845903006 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + w = 8.845903006 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + w = 8.845903006 + -2.5 w = 8.845903006 + -2.5 Combine like terms: 8.845903006 + -2.5 = 6.345903006 w = 6.345903006 Simplifying w = 6.345903006

Subproblem 2

w + 2.5 = -8.845903006 Simplifying w + 2.5 = -8.845903006 Reorder the terms: 2.5 + w = -8.845903006 Solving 2.5 + w = -8.845903006 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + w = -8.845903006 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + w = -8.845903006 + -2.5 w = -8.845903006 + -2.5 Combine like terms: -8.845903006 + -2.5 = -11.345903006 w = -11.345903006 Simplifying w = -11.345903006

Solution

The solution to the problem is based on the solutions from the subproblems. w = {6.345903006, -11.345903006}

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