x^2-5x=23

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Solution for x^2-5x=23 equation:


Simplifying
x2 + -5x = 23

Reorder the terms:
-5x + x2 = 23

Solving
-5x + x2 = 23

Solving for variable 'x'.

Reorder the terms:
-23 + -5x + x2 = 23 + -23

Combine like terms: 23 + -23 = 0
-23 + -5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '23' to each side of the equation.
-23 + -5x + 23 + x2 = 0 + 23

Reorder the terms:
-23 + 23 + -5x + x2 = 0 + 23

Combine like terms: -23 + 23 = 0
0 + -5x + x2 = 0 + 23
-5x + x2 = 0 + 23

Combine like terms: 0 + 23 = 23
-5x + x2 = 23

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 = 23 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 23 + 6.25

Combine like terms: 23 + 6.25 = 29.25
6.25 + -5x + x2 = 29.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 29.25

Calculate the square root of the right side: 5.408326913

Break this problem into two subproblems by setting 
(x + -2.5) equal to 5.408326913 and -5.408326913.

Subproblem 1

x + -2.5 = 5.408326913 Simplifying x + -2.5 = 5.408326913 Reorder the terms: -2.5 + x = 5.408326913 Solving -2.5 + x = 5.408326913 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 = 5.408326913 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 5.408326913 + 2.5 x = 5.408326913 + 2.5 Combine like terms: 5.408326913 + 2.5 = 7.908326913 x = 7.908326913 Simplifying x = 7.908326913

Subproblem 2

x + -2.5 = -5.408326913 Simplifying x + -2.5 = -5.408326913 Reorder the terms: -2.5 + x = -5.408326913 Solving -2.5 + x = -5.408326913 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 = -5.408326913 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -5.408326913 + 2.5 x = -5.408326913 + 2.5 Combine like terms: -5.408326913 + 2.5 = -2.908326913 x = -2.908326913 Simplifying x = -2.908326913

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.908326913, -2.908326913}

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