w^2-3w-80=0

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Solution for w^2-3w-80=0 equation:


Simplifying
w2 + -3w + -80 = 0

Reorder the terms:
-80 + -3w + w2 = 0

Solving
-80 + -3w + w2 = 0

Solving for variable 'w'.

Begin completing the square.

Move the constant term to the right:

Add '80' to each side of the equation.
-80 + -3w + 80 + w2 = 0 + 80

Reorder the terms:
-80 + 80 + -3w + w2 = 0 + 80

Combine like terms: -80 + 80 = 0
0 + -3w + w2 = 0 + 80
-3w + w2 = 0 + 80

Combine like terms: 0 + 80 = 80
-3w + w2 = 80

The w term is -3w.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3w + 2.25 + w2 = 80 + 2.25

Reorder the terms:
2.25 + -3w + w2 = 80 + 2.25

Combine like terms: 80 + 2.25 = 82.25
2.25 + -3w + w2 = 82.25

Factor a perfect square on the left side:
(w + -1.5)(w + -1.5) = 82.25

Calculate the square root of the right side: 9.069178574

Break this problem into two subproblems by setting 
(w + -1.5) equal to 9.069178574 and -9.069178574.

Subproblem 1

w + -1.5 = 9.069178574 Simplifying w + -1.5 = 9.069178574 Reorder the terms: -1.5 + w = 9.069178574 Solving -1.5 + w = 9.069178574 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + w = 9.069178574 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + w = 9.069178574 + 1.5 w = 9.069178574 + 1.5 Combine like terms: 9.069178574 + 1.5 = 10.569178574 w = 10.569178574 Simplifying w = 10.569178574

Subproblem 2

w + -1.5 = -9.069178574 Simplifying w + -1.5 = -9.069178574 Reorder the terms: -1.5 + w = -9.069178574 Solving -1.5 + w = -9.069178574 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + w = -9.069178574 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + w = -9.069178574 + 1.5 w = -9.069178574 + 1.5 Combine like terms: -9.069178574 + 1.5 = -7.569178574 w = -7.569178574 Simplifying w = -7.569178574

Solution

The solution to the problem is based on the solutions from the subproblems. w = {10.569178574, -7.569178574}

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