11x^2-4x-5=0

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Solution for 11x^2-4x-5=0 equation:


Simplifying
11x2 + -4x + -5 = 0

Reorder the terms:
-5 + -4x + 11x2 = 0

Solving
-5 + -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'.
-0.4545454545 + -0.3636363636x + x2 = 0

Move the constant term to the right:

Add '0.4545454545' to each side of the equation.
-0.4545454545 + -0.3636363636x + 0.4545454545 + x2 = 0 + 0.4545454545

Reorder the terms:
-0.4545454545 + 0.4545454545 + -0.3636363636x + x2 = 0 + 0.4545454545

Combine like terms: -0.4545454545 + 0.4545454545 = 0.0000000000
0.0000000000 + -0.3636363636x + x2 = 0 + 0.4545454545
-0.3636363636x + x2 = 0 + 0.4545454545

Combine like terms: 0 + 0.4545454545 = 0.4545454545
-0.3636363636x + x2 = 0.4545454545

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 = 0.4545454545 + 0.03305785123

Reorder the terms:
0.03305785123 + -0.3636363636x + x2 = 0.4545454545 + 0.03305785123

Combine like terms: 0.4545454545 + 0.03305785123 = 0.48760330573
0.03305785123 + -0.3636363636x + x2 = 0.48760330573

Factor a perfect square on the left side:
(x + -0.1818181818)(x + -0.1818181818) = 0.48760330573

Calculate the square root of the right side: 0.698285977

Break this problem into two subproblems by setting 
(x + -0.1818181818) equal to 0.698285977 and -0.698285977.

Subproblem 1

x + -0.1818181818 = 0.698285977 Simplifying x + -0.1818181818 = 0.698285977 Reorder the terms: -0.1818181818 + x = 0.698285977 Solving -0.1818181818 + x = 0.698285977 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 = 0.698285977 + 0.1818181818 Combine like terms: -0.1818181818 + 0.1818181818 = 0.0000000000 0.0000000000 + x = 0.698285977 + 0.1818181818 x = 0.698285977 + 0.1818181818 Combine like terms: 0.698285977 + 0.1818181818 = 0.8801041588 x = 0.8801041588 Simplifying x = 0.8801041588

Subproblem 2

x + -0.1818181818 = -0.698285977 Simplifying x + -0.1818181818 = -0.698285977 Reorder the terms: -0.1818181818 + x = -0.698285977 Solving -0.1818181818 + x = -0.698285977 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 = -0.698285977 + 0.1818181818 Combine like terms: -0.1818181818 + 0.1818181818 = 0.0000000000 0.0000000000 + x = -0.698285977 + 0.1818181818 x = -0.698285977 + 0.1818181818 Combine like terms: -0.698285977 + 0.1818181818 = -0.5164677952 x = -0.5164677952 Simplifying x = -0.5164677952

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.8801041588, -0.5164677952}

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