x^2+23x-72=

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


Simplifying
x2 + 23x + -72 = 0

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

Solving
-72 + 23x + x2 = 0

Solving for variable 'x'.

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 = 2.791605928 x = 2.791605928 Simplifying x = 2.791605928

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 = -25.791605928 x = -25.791605928 Simplifying x = -25.791605928

Solution

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

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