0=x^2+9x-110

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Solution for 0=x^2+9x-110 equation:


Simplifying
0 = x2 + 9x + -110

Reorder the terms:
0 = -110 + 9x + x2

Solving
0 = -110 + 9x + x2

Solving for variable 'x'.

Combine like terms: 0 + 110 = 110
110 + -9x + -1x2 = -110 + 9x + x2 + 110 + -9x + -1x2

Reorder the terms:
110 + -9x + -1x2 = -110 + 110 + 9x + -9x + x2 + -1x2

Combine like terms: -110 + 110 = 0
110 + -9x + -1x2 = 0 + 9x + -9x + x2 + -1x2
110 + -9x + -1x2 = 9x + -9x + x2 + -1x2

Combine like terms: 9x + -9x = 0
110 + -9x + -1x2 = 0 + x2 + -1x2
110 + -9x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
110 + -9x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-110 + 9x + x2 = 0

Move the constant term to the right:

Add '110' to each side of the equation.
-110 + 9x + 110 + x2 = 0 + 110

Reorder the terms:
-110 + 110 + 9x + x2 = 0 + 110

Combine like terms: -110 + 110 = 0
0 + 9x + x2 = 0 + 110
9x + x2 = 0 + 110

Combine like terms: 0 + 110 = 110
9x + x2 = 110

The x term is 9x.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9x + 20.25 + x2 = 110 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 110 + 20.25

Combine like terms: 110 + 20.25 = 130.25
20.25 + 9x + x2 = 130.25

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 130.25

Calculate the square root of the right side: 11.412712211

Break this problem into two subproblems by setting 
(x + 4.5) equal to 11.412712211 and -11.412712211.

Subproblem 1

x + 4.5 = 11.412712211 Simplifying x + 4.5 = 11.412712211 Reorder the terms: 4.5 + x = 11.412712211 Solving 4.5 + x = 11.412712211 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = 11.412712211 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 11.412712211 + -4.5 x = 11.412712211 + -4.5 Combine like terms: 11.412712211 + -4.5 = 6.912712211 x = 6.912712211 Simplifying x = 6.912712211

Subproblem 2

x + 4.5 = -11.412712211 Simplifying x + 4.5 = -11.412712211 Reorder the terms: 4.5 + x = -11.412712211 Solving 4.5 + x = -11.412712211 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = -11.412712211 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -11.412712211 + -4.5 x = -11.412712211 + -4.5 Combine like terms: -11.412712211 + -4.5 = -15.912712211 x = -15.912712211 Simplifying x = -15.912712211

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.912712211, -15.912712211}

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