12x^2-81x-124=0

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Solution for 12x^2-81x-124=0 equation:


Simplifying
12x2 + -81x + -124 = 0

Reorder the terms:
-124 + -81x + 12x2 = 0

Solving
-124 + -81x + 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'.
-10.33333333 + -6.75x + x2 = 0

Move the constant term to the right:

Add '10.33333333' to each side of the equation.
-10.33333333 + -6.75x + 10.33333333 + x2 = 0 + 10.33333333

Reorder the terms:
-10.33333333 + 10.33333333 + -6.75x + x2 = 0 + 10.33333333

Combine like terms: -10.33333333 + 10.33333333 = 0.00000000
0.00000000 + -6.75x + x2 = 0 + 10.33333333
-6.75x + x2 = 0 + 10.33333333

Combine like terms: 0 + 10.33333333 = 10.33333333
-6.75x + x2 = 10.33333333

The x term is -6.75x.  Take half its coefficient (-3.375).
Square it (11.390625) and add it to both sides.

Add '11.390625' to each side of the equation.
-6.75x + 11.390625 + x2 = 10.33333333 + 11.390625

Reorder the terms:
11.390625 + -6.75x + x2 = 10.33333333 + 11.390625

Combine like terms: 10.33333333 + 11.390625 = 21.72395833
11.390625 + -6.75x + x2 = 21.72395833

Factor a perfect square on the left side:
(x + -3.375)(x + -3.375) = 21.72395833

Calculate the square root of the right side: 4.66089673

Break this problem into two subproblems by setting 
(x + -3.375) equal to 4.66089673 and -4.66089673.

Subproblem 1

x + -3.375 = 4.66089673 Simplifying x + -3.375 = 4.66089673 Reorder the terms: -3.375 + x = 4.66089673 Solving -3.375 + x = 4.66089673 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.375' to each side of the equation. -3.375 + 3.375 + x = 4.66089673 + 3.375 Combine like terms: -3.375 + 3.375 = 0.000 0.000 + x = 4.66089673 + 3.375 x = 4.66089673 + 3.375 Combine like terms: 4.66089673 + 3.375 = 8.03589673 x = 8.03589673 Simplifying x = 8.03589673

Subproblem 2

x + -3.375 = -4.66089673 Simplifying x + -3.375 = -4.66089673 Reorder the terms: -3.375 + x = -4.66089673 Solving -3.375 + x = -4.66089673 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.375' to each side of the equation. -3.375 + 3.375 + x = -4.66089673 + 3.375 Combine like terms: -3.375 + 3.375 = 0.000 0.000 + x = -4.66089673 + 3.375 x = -4.66089673 + 3.375 Combine like terms: -4.66089673 + 3.375 = -1.28589673 x = -1.28589673 Simplifying x = -1.28589673

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.03589673, -1.28589673}

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