9a^2-12a-4=0

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


Simplifying
9a2 + -12a + -4 = 0

Reorder the terms:
-4 + -12a + 9a2 = 0

Solving
-4 + -12a + 9a2 = 0

Solving for variable 'a'.

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

Divide each side by '9'.
-0.4444444444 + -1.333333333a + a2 = 0

Move the constant term to the right:

Add '0.4444444444' to each side of the equation.
-0.4444444444 + -1.333333333a + 0.4444444444 + a2 = 0 + 0.4444444444

Reorder the terms:
-0.4444444444 + 0.4444444444 + -1.333333333a + a2 = 0 + 0.4444444444

Combine like terms: -0.4444444444 + 0.4444444444 = 0.0000000000
0.0000000000 + -1.333333333a + a2 = 0 + 0.4444444444
-1.333333333a + a2 = 0 + 0.4444444444

Combine like terms: 0 + 0.4444444444 = 0.4444444444
-1.333333333a + a2 = 0.4444444444

The a term is -1.333333333a.  Take half its coefficient (-0.6666666665).
Square it (0.4444444442) and add it to both sides.

Add '0.4444444442' to each side of the equation.
-1.333333333a + 0.4444444442 + a2 = 0.4444444444 + 0.4444444442

Reorder the terms:
0.4444444442 + -1.333333333a + a2 = 0.4444444444 + 0.4444444442

Combine like terms: 0.4444444444 + 0.4444444442 = 0.8888888886
0.4444444442 + -1.333333333a + a2 = 0.8888888886

Factor a perfect square on the left side:
(a + -0.6666666665)(a + -0.6666666665) = 0.8888888886

Calculate the square root of the right side: 0.942809041

Break this problem into two subproblems by setting 
(a + -0.6666666665) equal to 0.942809041 and -0.942809041.

Subproblem 1

a + -0.6666666665 = 0.942809041 Simplifying a + -0.6666666665 = 0.942809041 Reorder the terms: -0.6666666665 + a = 0.942809041 Solving -0.6666666665 + a = 0.942809041 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.6666666665' to each side of the equation. -0.6666666665 + 0.6666666665 + a = 0.942809041 + 0.6666666665 Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000 0.0000000000 + a = 0.942809041 + 0.6666666665 a = 0.942809041 + 0.6666666665 Combine like terms: 0.942809041 + 0.6666666665 = 1.6094757075 a = 1.6094757075 Simplifying a = 1.6094757075

Subproblem 2

a + -0.6666666665 = -0.942809041 Simplifying a + -0.6666666665 = -0.942809041 Reorder the terms: -0.6666666665 + a = -0.942809041 Solving -0.6666666665 + a = -0.942809041 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.6666666665' to each side of the equation. -0.6666666665 + 0.6666666665 + a = -0.942809041 + 0.6666666665 Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000 0.0000000000 + a = -0.942809041 + 0.6666666665 a = -0.942809041 + 0.6666666665 Combine like terms: -0.942809041 + 0.6666666665 = -0.2761423745 a = -0.2761423745 Simplifying a = -0.2761423745

Solution

The solution to the problem is based on the solutions from the subproblems. a = {1.6094757075, -0.2761423745}

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