12x^2-9x-4=0

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Solution for 12x^2-9x-4=0 equation:


Simplifying
12x2 + -9x + -4 = 0

Reorder the terms:
-4 + -9x + 12x2 = 0

Solving
-4 + -9x + 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'.
-0.3333333333 + -0.75x + x2 = 0

Move the constant term to the right:

Add '0.3333333333' to each side of the equation.
-0.3333333333 + -0.75x + 0.3333333333 + x2 = 0 + 0.3333333333

Reorder the terms:
-0.3333333333 + 0.3333333333 + -0.75x + x2 = 0 + 0.3333333333

Combine like terms: -0.3333333333 + 0.3333333333 = 0.0000000000
0.0000000000 + -0.75x + x2 = 0 + 0.3333333333
-0.75x + x2 = 0 + 0.3333333333

Combine like terms: 0 + 0.3333333333 = 0.3333333333
-0.75x + x2 = 0.3333333333

The x term is -0.75x.  Take half its coefficient (-0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
-0.75x + 0.140625 + x2 = 0.3333333333 + 0.140625

Reorder the terms:
0.140625 + -0.75x + x2 = 0.3333333333 + 0.140625

Combine like terms: 0.3333333333 + 0.140625 = 0.4739583333
0.140625 + -0.75x + x2 = 0.4739583333

Factor a perfect square on the left side:
(x + -0.375)(x + -0.375) = 0.4739583333

Calculate the square root of the right side: 0.688446318

Break this problem into two subproblems by setting 
(x + -0.375) equal to 0.688446318 and -0.688446318.

Subproblem 1

x + -0.375 = 0.688446318 Simplifying x + -0.375 = 0.688446318 Reorder the terms: -0.375 + x = 0.688446318 Solving -0.375 + x = 0.688446318 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = 0.688446318 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = 0.688446318 + 0.375 x = 0.688446318 + 0.375 Combine like terms: 0.688446318 + 0.375 = 1.063446318 x = 1.063446318 Simplifying x = 1.063446318

Subproblem 2

x + -0.375 = -0.688446318 Simplifying x + -0.375 = -0.688446318 Reorder the terms: -0.375 + x = -0.688446318 Solving -0.375 + x = -0.688446318 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = -0.688446318 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = -0.688446318 + 0.375 x = -0.688446318 + 0.375 Combine like terms: -0.688446318 + 0.375 = -0.313446318 x = -0.313446318 Simplifying x = -0.313446318

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.063446318, -0.313446318}

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