12d^2-14d-1=0

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Solution for 12d^2-14d-1=0 equation:


Simplifying
12d2 + -14d + -1 = 0

Reorder the terms:
-1 + -14d + 12d2 = 0

Solving
-1 + -14d + 12d2 = 0

Solving for variable 'd'.

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

Divide each side by '12'.
-0.08333333333 + -1.166666667d + d2 = 0

Move the constant term to the right:

Add '0.08333333333' to each side of the equation.
-0.08333333333 + -1.166666667d + 0.08333333333 + d2 = 0 + 0.08333333333

Reorder the terms:
-0.08333333333 + 0.08333333333 + -1.166666667d + d2 = 0 + 0.08333333333

Combine like terms: -0.08333333333 + 0.08333333333 = 0.00000000000
0.00000000000 + -1.166666667d + d2 = 0 + 0.08333333333
-1.166666667d + d2 = 0 + 0.08333333333

Combine like terms: 0 + 0.08333333333 = 0.08333333333
-1.166666667d + d2 = 0.08333333333

The d term is -1.166666667d.  Take half its coefficient (-0.5833333335).
Square it (0.3402777780) and add it to both sides.

Add '0.3402777780' to each side of the equation.
-1.166666667d + 0.3402777780 + d2 = 0.08333333333 + 0.3402777780

Reorder the terms:
0.3402777780 + -1.166666667d + d2 = 0.08333333333 + 0.3402777780

Combine like terms: 0.08333333333 + 0.3402777780 = 0.42361111133
0.3402777780 + -1.166666667d + d2 = 0.42361111133

Factor a perfect square on the left side:
(d + -0.5833333335)(d + -0.5833333335) = 0.42361111133

Calculate the square root of the right side: 0.65085414

Break this problem into two subproblems by setting 
(d + -0.5833333335) equal to 0.65085414 and -0.65085414.

Subproblem 1

d + -0.5833333335 = 0.65085414 Simplifying d + -0.5833333335 = 0.65085414 Reorder the terms: -0.5833333335 + d = 0.65085414 Solving -0.5833333335 + d = 0.65085414 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '0.5833333335' to each side of the equation. -0.5833333335 + 0.5833333335 + d = 0.65085414 + 0.5833333335 Combine like terms: -0.5833333335 + 0.5833333335 = 0.0000000000 0.0000000000 + d = 0.65085414 + 0.5833333335 d = 0.65085414 + 0.5833333335 Combine like terms: 0.65085414 + 0.5833333335 = 1.2341874735 d = 1.2341874735 Simplifying d = 1.2341874735

Subproblem 2

d + -0.5833333335 = -0.65085414 Simplifying d + -0.5833333335 = -0.65085414 Reorder the terms: -0.5833333335 + d = -0.65085414 Solving -0.5833333335 + d = -0.65085414 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '0.5833333335' to each side of the equation. -0.5833333335 + 0.5833333335 + d = -0.65085414 + 0.5833333335 Combine like terms: -0.5833333335 + 0.5833333335 = 0.0000000000 0.0000000000 + d = -0.65085414 + 0.5833333335 d = -0.65085414 + 0.5833333335 Combine like terms: -0.65085414 + 0.5833333335 = -0.0675208065 d = -0.0675208065 Simplifying d = -0.0675208065

Solution

The solution to the problem is based on the solutions from the subproblems. d = {1.2341874735, -0.0675208065}

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