x^2-15x-110=0

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Solution for x^2-15x-110=0 equation:


Simplifying
x2 + -15x + -110 = 0

Reorder the terms:
-110 + -15x + x2 = 0

Solving
-110 + -15x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '110' to each side of the equation.
-110 + -15x + 110 + x2 = 0 + 110

Reorder the terms:
-110 + 110 + -15x + x2 = 0 + 110

Combine like terms: -110 + 110 = 0
0 + -15x + x2 = 0 + 110
-15x + x2 = 0 + 110

Combine like terms: 0 + 110 = 110
-15x + x2 = 110

The x term is -15x.  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.
-15x + 56.25 + x2 = 110 + 56.25

Reorder the terms:
56.25 + -15x + x2 = 110 + 56.25

Combine like terms: 110 + 56.25 = 166.25
56.25 + -15x + x2 = 166.25

Factor a perfect square on the left side:
(x + -7.5)(x + -7.5) = 166.25

Calculate the square root of the right side: 12.893796958

Break this problem into two subproblems by setting 
(x + -7.5) equal to 12.893796958 and -12.893796958.

Subproblem 1

x + -7.5 = 12.893796958 Simplifying x + -7.5 = 12.893796958 Reorder the terms: -7.5 + x = 12.893796958 Solving -7.5 + x = 12.893796958 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = 12.893796958 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = 12.893796958 + 7.5 x = 12.893796958 + 7.5 Combine like terms: 12.893796958 + 7.5 = 20.393796958 x = 20.393796958 Simplifying x = 20.393796958

Subproblem 2

x + -7.5 = -12.893796958 Simplifying x + -7.5 = -12.893796958 Reorder the terms: -7.5 + x = -12.893796958 Solving -7.5 + x = -12.893796958 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = -12.893796958 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = -12.893796958 + 7.5 x = -12.893796958 + 7.5 Combine like terms: -12.893796958 + 7.5 = -5.393796958 x = -5.393796958 Simplifying x = -5.393796958

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20.393796958, -5.393796958}

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