2x^2-18x-23=0

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Solution for 2x^2-18x-23=0 equation:


Simplifying
2x2 + -18x + -23 = 0

Reorder the terms:
-23 + -18x + 2x2 = 0

Solving
-23 + -18x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-11.5 + -9x + x2 = 0

Move the constant term to the right:

Add '11.5' to each side of the equation.
-11.5 + -9x + 11.5 + x2 = 0 + 11.5

Reorder the terms:
-11.5 + 11.5 + -9x + x2 = 0 + 11.5

Combine like terms: -11.5 + 11.5 = 0.0
0.0 + -9x + x2 = 0 + 11.5
-9x + x2 = 0 + 11.5

Combine like terms: 0 + 11.5 = 11.5
-9x + x2 = 11.5

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 = 11.5 + 20.25

Reorder the terms:
20.25 + -9x + x2 = 11.5 + 20.25

Combine like terms: 11.5 + 20.25 = 31.75
20.25 + -9x + x2 = 31.75

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = 31.75

Calculate the square root of the right side: 5.634713835

Break this problem into two subproblems by setting 
(x + -4.5) equal to 5.634713835 and -5.634713835.

Subproblem 1

x + -4.5 = 5.634713835 Simplifying x + -4.5 = 5.634713835 Reorder the terms: -4.5 + x = 5.634713835 Solving -4.5 + x = 5.634713835 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 = 5.634713835 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 5.634713835 + 4.5 x = 5.634713835 + 4.5 Combine like terms: 5.634713835 + 4.5 = 10.134713835 x = 10.134713835 Simplifying x = 10.134713835

Subproblem 2

x + -4.5 = -5.634713835 Simplifying x + -4.5 = -5.634713835 Reorder the terms: -4.5 + x = -5.634713835 Solving -4.5 + x = -5.634713835 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 = -5.634713835 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -5.634713835 + 4.5 x = -5.634713835 + 4.5 Combine like terms: -5.634713835 + 4.5 = -1.134713835 x = -1.134713835 Simplifying x = -1.134713835

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.134713835, -1.134713835}

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