12x^2+11x-72=0

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Solution for 12x^2+11x-72=0 equation:


Simplifying
12x2 + 11x + -72 = 0

Reorder the terms:
-72 + 11x + 12x2 = 0

Solving
-72 + 11x + 12x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
12 the coefficient of the squared term: 

Divide each side by '12'.
-6 + 0.9166666667x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + 0.9166666667x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + 0.9166666667x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 0.9166666667x + x2 = 0 + 6
0.9166666667x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
0.9166666667x + x2 = 6

The x term is 0.9166666667x.  Take half its coefficient (0.4583333334).
Square it (0.2100694445) and add it to both sides.

Add '0.2100694445' to each side of the equation.
0.9166666667x + 0.2100694445 + x2 = 6 + 0.2100694445

Reorder the terms:
0.2100694445 + 0.9166666667x + x2 = 6 + 0.2100694445

Combine like terms: 6 + 0.2100694445 = 6.2100694445
0.2100694445 + 0.9166666667x + x2 = 6.2100694445

Factor a perfect square on the left side:
(x + 0.4583333334)(x + 0.4583333334) = 6.2100694445

Calculate the square root of the right side: 2.492001092

Break this problem into two subproblems by setting 
(x + 0.4583333334) equal to 2.492001092 and -2.492001092.

Subproblem 1

x + 0.4583333334 = 2.492001092 Simplifying x + 0.4583333334 = 2.492001092 Reorder the terms: 0.4583333334 + x = 2.492001092 Solving 0.4583333334 + x = 2.492001092 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4583333334' to each side of the equation. 0.4583333334 + -0.4583333334 + x = 2.492001092 + -0.4583333334 Combine like terms: 0.4583333334 + -0.4583333334 = 0.0000000000 0.0000000000 + x = 2.492001092 + -0.4583333334 x = 2.492001092 + -0.4583333334 Combine like terms: 2.492001092 + -0.4583333334 = 2.0336677586 x = 2.0336677586 Simplifying x = 2.0336677586

Subproblem 2

x + 0.4583333334 = -2.492001092 Simplifying x + 0.4583333334 = -2.492001092 Reorder the terms: 0.4583333334 + x = -2.492001092 Solving 0.4583333334 + x = -2.492001092 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4583333334' to each side of the equation. 0.4583333334 + -0.4583333334 + x = -2.492001092 + -0.4583333334 Combine like terms: 0.4583333334 + -0.4583333334 = 0.0000000000 0.0000000000 + x = -2.492001092 + -0.4583333334 x = -2.492001092 + -0.4583333334 Combine like terms: -2.492001092 + -0.4583333334 = -2.9503344254 x = -2.9503344254 Simplifying x = -2.9503344254

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.0336677586, -2.9503344254}

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