2x^2-23x-72=0

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Solution for 2x^2-23x-72=0 equation:


Simplifying
2x2 + -23x + -72 = 0

Reorder the terms:
-72 + -23x + 2x2 = 0

Solving
-72 + -23x + 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'.
-36 + -11.5x + x2 = 0

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + -11.5x + 36 + x2 = 0 + 36

Reorder the terms:
-36 + 36 + -11.5x + x2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + -11.5x + x2 = 0 + 36
-11.5x + x2 = 0 + 36

Combine like terms: 0 + 36 = 36
-11.5x + x2 = 36

The x term is -11.5x.  Take half its coefficient (-5.75).
Square it (33.0625) and add it to both sides.

Add '33.0625' to each side of the equation.
-11.5x + 33.0625 + x2 = 36 + 33.0625

Reorder the terms:
33.0625 + -11.5x + x2 = 36 + 33.0625

Combine like terms: 36 + 33.0625 = 69.0625
33.0625 + -11.5x + x2 = 69.0625

Factor a perfect square on the left side:
(x + -5.75)(x + -5.75) = 69.0625

Calculate the square root of the right side: 8.310385069

Break this problem into two subproblems by setting 
(x + -5.75) equal to 8.310385069 and -8.310385069.

Subproblem 1

x + -5.75 = 8.310385069 Simplifying x + -5.75 = 8.310385069 Reorder the terms: -5.75 + x = 8.310385069 Solving -5.75 + x = 8.310385069 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.75' to each side of the equation. -5.75 + 5.75 + x = 8.310385069 + 5.75 Combine like terms: -5.75 + 5.75 = 0.00 0.00 + x = 8.310385069 + 5.75 x = 8.310385069 + 5.75 Combine like terms: 8.310385069 + 5.75 = 14.060385069 x = 14.060385069 Simplifying x = 14.060385069

Subproblem 2

x + -5.75 = -8.310385069 Simplifying x + -5.75 = -8.310385069 Reorder the terms: -5.75 + x = -8.310385069 Solving -5.75 + x = -8.310385069 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.75' to each side of the equation. -5.75 + 5.75 + x = -8.310385069 + 5.75 Combine like terms: -5.75 + 5.75 = 0.00 0.00 + x = -8.310385069 + 5.75 x = -8.310385069 + 5.75 Combine like terms: -8.310385069 + 5.75 = -2.560385069 x = -2.560385069 Simplifying x = -2.560385069

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.060385069, -2.560385069}

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