11a^2-12a-2=0

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Solution for 11a^2-12a-2=0 equation:


Simplifying
11a2 + -12a + -2 = 0

Reorder the terms:
-2 + -12a + 11a2 = 0

Solving
-2 + -12a + 11a2 = 0

Solving for variable 'a'.

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

Divide each side by '11'.
-0.1818181818 + -1.090909091a + a2 = 0

Move the constant term to the right:

Add '0.1818181818' to each side of the equation.
-0.1818181818 + -1.090909091a + 0.1818181818 + a2 = 0 + 0.1818181818

Reorder the terms:
-0.1818181818 + 0.1818181818 + -1.090909091a + a2 = 0 + 0.1818181818

Combine like terms: -0.1818181818 + 0.1818181818 = 0.0000000000
0.0000000000 + -1.090909091a + a2 = 0 + 0.1818181818
-1.090909091a + a2 = 0 + 0.1818181818

Combine like terms: 0 + 0.1818181818 = 0.1818181818
-1.090909091a + a2 = 0.1818181818

The a term is -1.090909091a.  Take half its coefficient (-0.5454545455).
Square it (0.2975206612) and add it to both sides.

Add '0.2975206612' to each side of the equation.
-1.090909091a + 0.2975206612 + a2 = 0.1818181818 + 0.2975206612

Reorder the terms:
0.2975206612 + -1.090909091a + a2 = 0.1818181818 + 0.2975206612

Combine like terms: 0.1818181818 + 0.2975206612 = 0.479338843
0.2975206612 + -1.090909091a + a2 = 0.479338843

Factor a perfect square on the left side:
(a + -0.5454545455)(a + -0.5454545455) = 0.479338843

Calculate the square root of the right side: 0.69234301

Break this problem into two subproblems by setting 
(a + -0.5454545455) equal to 0.69234301 and -0.69234301.

Subproblem 1

a + -0.5454545455 = 0.69234301 Simplifying a + -0.5454545455 = 0.69234301 Reorder the terms: -0.5454545455 + a = 0.69234301 Solving -0.5454545455 + a = 0.69234301 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.5454545455' to each side of the equation. -0.5454545455 + 0.5454545455 + a = 0.69234301 + 0.5454545455 Combine like terms: -0.5454545455 + 0.5454545455 = 0.0000000000 0.0000000000 + a = 0.69234301 + 0.5454545455 a = 0.69234301 + 0.5454545455 Combine like terms: 0.69234301 + 0.5454545455 = 1.2377975555 a = 1.2377975555 Simplifying a = 1.2377975555

Subproblem 2

a + -0.5454545455 = -0.69234301 Simplifying a + -0.5454545455 = -0.69234301 Reorder the terms: -0.5454545455 + a = -0.69234301 Solving -0.5454545455 + a = -0.69234301 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.5454545455' to each side of the equation. -0.5454545455 + 0.5454545455 + a = -0.69234301 + 0.5454545455 Combine like terms: -0.5454545455 + 0.5454545455 = 0.0000000000 0.0000000000 + a = -0.69234301 + 0.5454545455 a = -0.69234301 + 0.5454545455 Combine like terms: -0.69234301 + 0.5454545455 = -0.1468884645 a = -0.1468884645 Simplifying a = -0.1468884645

Solution

The solution to the problem is based on the solutions from the subproblems. a = {1.2377975555, -0.1468884645}

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