12x^2-x-19=0

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Solution for 12x^2-x-19=0 equation:


Simplifying
12x2 + -1x + -19 = 0

Reorder the terms:
-19 + -1x + 12x2 = 0

Solving
-19 + -1x + 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'.
-1.583333333 + -0.08333333333x + x2 = 0

Move the constant term to the right:

Add '1.583333333' to each side of the equation.
-1.583333333 + -0.08333333333x + 1.583333333 + x2 = 0 + 1.583333333

Reorder the terms:
-1.583333333 + 1.583333333 + -0.08333333333x + x2 = 0 + 1.583333333

Combine like terms: -1.583333333 + 1.583333333 = 0.000000000
0.000000000 + -0.08333333333x + x2 = 0 + 1.583333333
-0.08333333333x + x2 = 0 + 1.583333333

Combine like terms: 0 + 1.583333333 = 1.583333333
-0.08333333333x + x2 = 1.583333333

The x term is -0.08333333333x.  Take half its coefficient (-0.04166666667).
Square it (0.001736111111) and add it to both sides.

Add '0.001736111111' to each side of the equation.
-0.08333333333x + 0.001736111111 + x2 = 1.583333333 + 0.001736111111

Reorder the terms:
0.001736111111 + -0.08333333333x + x2 = 1.583333333 + 0.001736111111

Combine like terms: 1.583333333 + 0.001736111111 = 1.585069444111
0.001736111111 + -0.08333333333x + x2 = 1.585069444111

Factor a perfect square on the left side:
(x + -0.04166666667)(x + -0.04166666667) = 1.585069444111

Calculate the square root of the right side: 1.258995411

Break this problem into two subproblems by setting 
(x + -0.04166666667) equal to 1.258995411 and -1.258995411.

Subproblem 1

x + -0.04166666667 = 1.258995411 Simplifying x + -0.04166666667 = 1.258995411 Reorder the terms: -0.04166666667 + x = 1.258995411 Solving -0.04166666667 + x = 1.258995411 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.04166666667' to each side of the equation. -0.04166666667 + 0.04166666667 + x = 1.258995411 + 0.04166666667 Combine like terms: -0.04166666667 + 0.04166666667 = 0.00000000000 0.00000000000 + x = 1.258995411 + 0.04166666667 x = 1.258995411 + 0.04166666667 Combine like terms: 1.258995411 + 0.04166666667 = 1.30066207767 x = 1.30066207767 Simplifying x = 1.30066207767

Subproblem 2

x + -0.04166666667 = -1.258995411 Simplifying x + -0.04166666667 = -1.258995411 Reorder the terms: -0.04166666667 + x = -1.258995411 Solving -0.04166666667 + x = -1.258995411 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.04166666667' to each side of the equation. -0.04166666667 + 0.04166666667 + x = -1.258995411 + 0.04166666667 Combine like terms: -0.04166666667 + 0.04166666667 = 0.00000000000 0.00000000000 + x = -1.258995411 + 0.04166666667 x = -1.258995411 + 0.04166666667 Combine like terms: -1.258995411 + 0.04166666667 = -1.21732874433 x = -1.21732874433 Simplifying x = -1.21732874433

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.30066207767, -1.21732874433}

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