11x^2-4x-11=0

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Solution for 11x^2-4x-11=0 equation:


Simplifying
11x2 + -4x + -11 = 0

Reorder the terms:
-11 + -4x + 11x2 = 0

Solving
-11 + -4x + 11x2 = 0

Solving for variable 'x'.

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

Divide each side by '11'.
-1 + -0.3636363636x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -0.3636363636x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + -0.3636363636x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -0.3636363636x + x2 = 0 + 1
-0.3636363636x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-0.3636363636x + x2 = 1

The x term is -0.3636363636x.  Take half its coefficient (-0.1818181818).
Square it (0.03305785123) and add it to both sides.

Add '0.03305785123' to each side of the equation.
-0.3636363636x + 0.03305785123 + x2 = 1 + 0.03305785123

Reorder the terms:
0.03305785123 + -0.3636363636x + x2 = 1 + 0.03305785123

Combine like terms: 1 + 0.03305785123 = 1.03305785123
0.03305785123 + -0.3636363636x + x2 = 1.03305785123

Factor a perfect square on the left side:
(x + -0.1818181818)(x + -0.1818181818) = 1.03305785123

Calculate the square root of the right side: 1.016394535

Break this problem into two subproblems by setting 
(x + -0.1818181818) equal to 1.016394535 and -1.016394535.

Subproblem 1

x + -0.1818181818 = 1.016394535 Simplifying x + -0.1818181818 = 1.016394535 Reorder the terms: -0.1818181818 + x = 1.016394535 Solving -0.1818181818 + x = 1.016394535 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1818181818' to each side of the equation. -0.1818181818 + 0.1818181818 + x = 1.016394535 + 0.1818181818 Combine like terms: -0.1818181818 + 0.1818181818 = 0.0000000000 0.0000000000 + x = 1.016394535 + 0.1818181818 x = 1.016394535 + 0.1818181818 Combine like terms: 1.016394535 + 0.1818181818 = 1.1982127168 x = 1.1982127168 Simplifying x = 1.1982127168

Subproblem 2

x + -0.1818181818 = -1.016394535 Simplifying x + -0.1818181818 = -1.016394535 Reorder the terms: -0.1818181818 + x = -1.016394535 Solving -0.1818181818 + x = -1.016394535 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1818181818' to each side of the equation. -0.1818181818 + 0.1818181818 + x = -1.016394535 + 0.1818181818 Combine like terms: -0.1818181818 + 0.1818181818 = 0.0000000000 0.0000000000 + x = -1.016394535 + 0.1818181818 x = -1.016394535 + 0.1818181818 Combine like terms: -1.016394535 + 0.1818181818 = -0.8345763532 x = -0.8345763532 Simplifying x = -0.8345763532

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.1982127168, -0.8345763532}

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