12x^2-7x-11=0

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Solution for 12x^2-7x-11=0 equation:


Simplifying
12x2 + -7x + -11 = 0

Reorder the terms:
-11 + -7x + 12x2 = 0

Solving
-11 + -7x + 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'.
-0.9166666667 + -0.5833333333x + x2 = 0

Move the constant term to the right:

Add '0.9166666667' to each side of the equation.
-0.9166666667 + -0.5833333333x + 0.9166666667 + x2 = 0 + 0.9166666667

Reorder the terms:
-0.9166666667 + 0.9166666667 + -0.5833333333x + x2 = 0 + 0.9166666667

Combine like terms: -0.9166666667 + 0.9166666667 = 0.0000000000
0.0000000000 + -0.5833333333x + x2 = 0 + 0.9166666667
-0.5833333333x + x2 = 0 + 0.9166666667

Combine like terms: 0 + 0.9166666667 = 0.9166666667
-0.5833333333x + x2 = 0.9166666667

The x term is -0.5833333333x.  Take half its coefficient (-0.2916666667).
Square it (0.08506944446) and add it to both sides.

Add '0.08506944446' to each side of the equation.
-0.5833333333x + 0.08506944446 + x2 = 0.9166666667 + 0.08506944446

Reorder the terms:
0.08506944446 + -0.5833333333x + x2 = 0.9166666667 + 0.08506944446

Combine like terms: 0.9166666667 + 0.08506944446 = 1.00173611116
0.08506944446 + -0.5833333333x + x2 = 1.00173611116

Factor a perfect square on the left side:
(x + -0.2916666667)(x + -0.2916666667) = 1.00173611116

Calculate the square root of the right side: 1.000867679

Break this problem into two subproblems by setting 
(x + -0.2916666667) equal to 1.000867679 and -1.000867679.

Subproblem 1

x + -0.2916666667 = 1.000867679 Simplifying x + -0.2916666667 = 1.000867679 Reorder the terms: -0.2916666667 + x = 1.000867679 Solving -0.2916666667 + x = 1.000867679 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2916666667' to each side of the equation. -0.2916666667 + 0.2916666667 + x = 1.000867679 + 0.2916666667 Combine like terms: -0.2916666667 + 0.2916666667 = 0.0000000000 0.0000000000 + x = 1.000867679 + 0.2916666667 x = 1.000867679 + 0.2916666667 Combine like terms: 1.000867679 + 0.2916666667 = 1.2925343457 x = 1.2925343457 Simplifying x = 1.2925343457

Subproblem 2

x + -0.2916666667 = -1.000867679 Simplifying x + -0.2916666667 = -1.000867679 Reorder the terms: -0.2916666667 + x = -1.000867679 Solving -0.2916666667 + x = -1.000867679 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2916666667' to each side of the equation. -0.2916666667 + 0.2916666667 + x = -1.000867679 + 0.2916666667 Combine like terms: -0.2916666667 + 0.2916666667 = 0.0000000000 0.0000000000 + x = -1.000867679 + 0.2916666667 x = -1.000867679 + 0.2916666667 Combine like terms: -1.000867679 + 0.2916666667 = -0.7092010123 x = -0.7092010123 Simplifying x = -0.7092010123

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.2925343457, -0.7092010123}

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