12x^2-11x-40=0

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Solution for 12x^2-11x-40=0 equation:


Simplifying
12x2 + -11x + -40 = 0

Reorder the terms:
-40 + -11x + 12x2 = 0

Solving
-40 + -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'.
-3.333333333 + -0.9166666667x + x2 = 0

Move the constant term to the right:

Add '3.333333333' to each side of the equation.
-3.333333333 + -0.9166666667x + 3.333333333 + x2 = 0 + 3.333333333

Reorder the terms:
-3.333333333 + 3.333333333 + -0.9166666667x + x2 = 0 + 3.333333333

Combine like terms: -3.333333333 + 3.333333333 = 0.000000000
0.000000000 + -0.9166666667x + x2 = 0 + 3.333333333
-0.9166666667x + x2 = 0 + 3.333333333

Combine like terms: 0 + 3.333333333 = 3.333333333
-0.9166666667x + x2 = 3.333333333

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 = 3.333333333 + 0.2100694445

Reorder the terms:
0.2100694445 + -0.9166666667x + x2 = 3.333333333 + 0.2100694445

Combine like terms: 3.333333333 + 0.2100694445 = 3.5434027775
0.2100694445 + -0.9166666667x + x2 = 3.5434027775

Factor a perfect square on the left side:
(x + -0.4583333334)(x + -0.4583333334) = 3.5434027775

Calculate the square root of the right side: 1.882392833

Break this problem into two subproblems by setting 
(x + -0.4583333334) equal to 1.882392833 and -1.882392833.

Subproblem 1

x + -0.4583333334 = 1.882392833 Simplifying x + -0.4583333334 = 1.882392833 Reorder the terms: -0.4583333334 + x = 1.882392833 Solving -0.4583333334 + x = 1.882392833 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 = 1.882392833 + 0.4583333334 Combine like terms: -0.4583333334 + 0.4583333334 = 0.0000000000 0.0000000000 + x = 1.882392833 + 0.4583333334 x = 1.882392833 + 0.4583333334 Combine like terms: 1.882392833 + 0.4583333334 = 2.3407261664 x = 2.3407261664 Simplifying x = 2.3407261664

Subproblem 2

x + -0.4583333334 = -1.882392833 Simplifying x + -0.4583333334 = -1.882392833 Reorder the terms: -0.4583333334 + x = -1.882392833 Solving -0.4583333334 + x = -1.882392833 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 = -1.882392833 + 0.4583333334 Combine like terms: -0.4583333334 + 0.4583333334 = 0.0000000000 0.0000000000 + x = -1.882392833 + 0.4583333334 x = -1.882392833 + 0.4583333334 Combine like terms: -1.882392833 + 0.4583333334 = -1.4240594996 x = -1.4240594996 Simplifying x = -1.4240594996

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.3407261664, -1.4240594996}

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