w^2-3w-75=0

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Solution for w^2-3w-75=0 equation:


Simplifying
w2 + -3w + -75 = 0

Reorder the terms:
-75 + -3w + w2 = 0

Solving
-75 + -3w + w2 = 0

Solving for variable 'w'.

Begin completing the square.

Move the constant term to the right:

Add '75' to each side of the equation.
-75 + -3w + 75 + w2 = 0 + 75

Reorder the terms:
-75 + 75 + -3w + w2 = 0 + 75

Combine like terms: -75 + 75 = 0
0 + -3w + w2 = 0 + 75
-3w + w2 = 0 + 75

Combine like terms: 0 + 75 = 75
-3w + w2 = 75

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 = 75 + 2.25

Reorder the terms:
2.25 + -3w + w2 = 75 + 2.25

Combine like terms: 75 + 2.25 = 77.25
2.25 + -3w + w2 = 77.25

Factor a perfect square on the left side:
(w + -1.5)(w + -1.5) = 77.25

Calculate the square root of the right side: 8.789197916

Break this problem into two subproblems by setting 
(w + -1.5) equal to 8.789197916 and -8.789197916.

Subproblem 1

w + -1.5 = 8.789197916 Simplifying w + -1.5 = 8.789197916 Reorder the terms: -1.5 + w = 8.789197916 Solving -1.5 + w = 8.789197916 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 = 8.789197916 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + w = 8.789197916 + 1.5 w = 8.789197916 + 1.5 Combine like terms: 8.789197916 + 1.5 = 10.289197916 w = 10.289197916 Simplifying w = 10.289197916

Subproblem 2

w + -1.5 = -8.789197916 Simplifying w + -1.5 = -8.789197916 Reorder the terms: -1.5 + w = -8.789197916 Solving -1.5 + w = -8.789197916 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 = -8.789197916 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + w = -8.789197916 + 1.5 w = -8.789197916 + 1.5 Combine like terms: -8.789197916 + 1.5 = -7.289197916 w = -7.289197916 Simplifying w = -7.289197916

Solution

The solution to the problem is based on the solutions from the subproblems. w = {10.289197916, -7.289197916}

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