2x^2-10x-23=0

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Solution for 2x^2-10x-23=0 equation:


Simplifying
2x2 + -10x + -23 = 0

Reorder the terms:
-23 + -10x + 2x2 = 0

Solving
-23 + -10x + 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 + -5x + x2 = 0

Move the constant term to the right:

Add '11.5' to each side of the equation.
-11.5 + -5x + 11.5 + x2 = 0 + 11.5

Reorder the terms:
-11.5 + 11.5 + -5x + x2 = 0 + 11.5

Combine like terms: -11.5 + 11.5 = 0.0
0.0 + -5x + x2 = 0 + 11.5
-5x + x2 = 0 + 11.5

Combine like terms: 0 + 11.5 = 11.5
-5x + x2 = 11.5

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 11.5 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 11.5 + 6.25

Combine like terms: 11.5 + 6.25 = 17.75
6.25 + -5x + x2 = 17.75

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 17.75

Calculate the square root of the right side: 4.213074887

Break this problem into two subproblems by setting 
(x + -2.5) equal to 4.213074887 and -4.213074887.

Subproblem 1

x + -2.5 = 4.213074887 Simplifying x + -2.5 = 4.213074887 Reorder the terms: -2.5 + x = 4.213074887 Solving -2.5 + x = 4.213074887 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 4.213074887 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 4.213074887 + 2.5 x = 4.213074887 + 2.5 Combine like terms: 4.213074887 + 2.5 = 6.713074887 x = 6.713074887 Simplifying x = 6.713074887

Subproblem 2

x + -2.5 = -4.213074887 Simplifying x + -2.5 = -4.213074887 Reorder the terms: -2.5 + x = -4.213074887 Solving -2.5 + x = -4.213074887 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -4.213074887 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -4.213074887 + 2.5 x = -4.213074887 + 2.5 Combine like terms: -4.213074887 + 2.5 = -1.713074887 x = -1.713074887 Simplifying x = -1.713074887

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.713074887, -1.713074887}

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