12x^2+2x-13=0

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Solution for 12x^2+2x-13=0 equation: 


Simplifying
12x2 + 2x + -13 = 0

Reorder the terms:
-13 + 2x + 12x2 = 0

Solving
-13 + 2x + 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'.
-1.083333333 + 0.1666666667x + x2 = 0

Move the constant term to the right:

Add '1.083333333' to each side of the equation.
-1.083333333 + 0.1666666667x + 1.083333333 + x2 = 0 + 1.083333333

Reorder the terms:
-1.083333333 + 1.083333333 + 0.1666666667x + x2 = 0 + 1.083333333

Combine like terms: -1.083333333 + 1.083333333 = 0.000000000
0.000000000 + 0.1666666667x + x2 = 0 + 1.083333333
0.1666666667x + x2 = 0 + 1.083333333

Combine like terms: 0 + 1.083333333 = 1.083333333
0.1666666667x + x2 = 1.083333333

The x term is 0.1666666667x.  Take half its coefficient (0.08333333335).
Square it (0.006944444447) and add it to both sides.

Add '0.006944444447' to each side of the equation.
0.1666666667x + 0.006944444447 + x2 = 1.083333333 + 0.006944444447

Reorder the terms:
0.006944444447 + 0.1666666667x + x2 = 1.083333333 + 0.006944444447

Combine like terms: 1.083333333 + 0.006944444447 = 1.090277777447
0.006944444447 + 0.1666666667x + x2 = 1.090277777447

Factor a perfect square on the left side:
(x + 0.08333333335)(x + 0.08333333335) = 1.090277777447

Calculate the square root of the right side: 1.044163674

Break this problem into two subproblems by setting 
(x + 0.08333333335) equal to 1.044163674 and -1.044163674.


Subproblem 1
x + 0.08333333335 = 1.044163674

Simplifying
x + 0.08333333335 = 1.044163674

Reorder the terms:
0.08333333335 + x = 1.044163674

Solving
0.08333333335 + x = 1.044163674

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-0.08333333335' to each side of the equation.
0.08333333335 + -0.08333333335 + x = 1.044163674 + -0.08333333335

Combine like terms: 0.08333333335 + -0.08333333335 = 0.00000000000
0.00000000000 + x = 1.044163674 + -0.08333333335
x = 1.044163674 + -0.08333333335

Combine like terms: 1.044163674 + -0.08333333335 = 0.96083034065
x = 0.96083034065

Simplifying
x = 0.96083034065


Subproblem 2
x + 0.08333333335 = -1.044163674

Simplifying
x + 0.08333333335 = -1.044163674

Reorder the terms:
0.08333333335 + x = -1.044163674

Solving
0.08333333335 + x = -1.044163674

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-0.08333333335' to each side of the equation.
0.08333333335 + -0.08333333335 + x = -1.044163674 + -0.08333333335

Combine like terms: 0.08333333335 + -0.08333333335 = 0.00000000000
0.00000000000 + x = -1.044163674 + -0.08333333335
x = -1.044163674 + -0.08333333335

Combine like terms: -1.044163674 + -0.08333333335 = -1.12749700735
x = -1.12749700735

Simplifying
x = -1.12749700735


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.96083034065, -1.12749700735}

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