x^2-23x=72

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Solution for x^2-23x=72 equation:


Simplifying
x2 + -23x = 72

Reorder the terms:
-23x + x2 = 72

Solving
-23x + x2 = 72

Solving for variable 'x'.

Reorder the terms:
-72 + -23x + x2 = 72 + -72

Combine like terms: 72 + -72 = 0
-72 + -23x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '72' to each side of the equation.
-72 + -23x + 72 + x2 = 0 + 72

Reorder the terms:
-72 + 72 + -23x + x2 = 0 + 72

Combine like terms: -72 + 72 = 0
0 + -23x + x2 = 0 + 72
-23x + x2 = 0 + 72

Combine like terms: 0 + 72 = 72
-23x + x2 = 72

The x term is -23x.  Take half its coefficient (-11.5).
Square it (132.25) and add it to both sides.

Add '132.25' to each side of the equation.
-23x + 132.25 + x2 = 72 + 132.25

Reorder the terms:
132.25 + -23x + x2 = 72 + 132.25

Combine like terms: 72 + 132.25 = 204.25
132.25 + -23x + x2 = 204.25

Factor a perfect square on the left side:
(x + -11.5)(x + -11.5) = 204.25

Calculate the square root of the right side: 14.291605928

Break this problem into two subproblems by setting 
(x + -11.5) equal to 14.291605928 and -14.291605928.

Subproblem 1

x + -11.5 = 14.291605928 Simplifying x + -11.5 = 14.291605928 Reorder the terms: -11.5 + x = 14.291605928 Solving -11.5 + x = 14.291605928 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11.5' to each side of the equation. -11.5 + 11.5 + x = 14.291605928 + 11.5 Combine like terms: -11.5 + 11.5 = 0.0 0.0 + x = 14.291605928 + 11.5 x = 14.291605928 + 11.5 Combine like terms: 14.291605928 + 11.5 = 25.791605928 x = 25.791605928 Simplifying x = 25.791605928

Subproblem 2

x + -11.5 = -14.291605928 Simplifying x + -11.5 = -14.291605928 Reorder the terms: -11.5 + x = -14.291605928 Solving -11.5 + x = -14.291605928 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11.5' to each side of the equation. -11.5 + 11.5 + x = -14.291605928 + 11.5 Combine like terms: -11.5 + 11.5 = 0.0 0.0 + x = -14.291605928 + 11.5 x = -14.291605928 + 11.5 Combine like terms: -14.291605928 + 11.5 = -2.791605928 x = -2.791605928 Simplifying x = -2.791605928

Solution

The solution to the problem is based on the solutions from the subproblems. x = {25.791605928, -2.791605928}

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