11x^2-13x-4=0

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Solution for 11x^2-13x-4=0 equation:


Simplifying
11x2 + -13x + -4 = 0

Reorder the terms:
-4 + -13x + 11x2 = 0

Solving
-4 + -13x + 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'.
-0.3636363636 + -1.181818182x + x2 = 0

Move the constant term to the right:

Add '0.3636363636' to each side of the equation.
-0.3636363636 + -1.181818182x + 0.3636363636 + x2 = 0 + 0.3636363636

Reorder the terms:
-0.3636363636 + 0.3636363636 + -1.181818182x + x2 = 0 + 0.3636363636

Combine like terms: -0.3636363636 + 0.3636363636 = 0.0000000000
0.0000000000 + -1.181818182x + x2 = 0 + 0.3636363636
-1.181818182x + x2 = 0 + 0.3636363636

Combine like terms: 0 + 0.3636363636 = 0.3636363636
-1.181818182x + x2 = 0.3636363636

The x term is -1.181818182x.  Take half its coefficient (-0.590909091).
Square it (0.3491735538) and add it to both sides.

Add '0.3491735538' to each side of the equation.
-1.181818182x + 0.3491735538 + x2 = 0.3636363636 + 0.3491735538

Reorder the terms:
0.3491735538 + -1.181818182x + x2 = 0.3636363636 + 0.3491735538

Combine like terms: 0.3636363636 + 0.3491735538 = 0.7128099174
0.3491735538 + -1.181818182x + x2 = 0.7128099174

Factor a perfect square on the left side:
(x + -0.590909091)(x + -0.590909091) = 0.7128099174

Calculate the square root of the right side: 0.84428071

Break this problem into two subproblems by setting 
(x + -0.590909091) equal to 0.84428071 and -0.84428071.

Subproblem 1

x + -0.590909091 = 0.84428071 Simplifying x + -0.590909091 = 0.84428071 Reorder the terms: -0.590909091 + x = 0.84428071 Solving -0.590909091 + x = 0.84428071 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.590909091' to each side of the equation. -0.590909091 + 0.590909091 + x = 0.84428071 + 0.590909091 Combine like terms: -0.590909091 + 0.590909091 = 0.000000000 0.000000000 + x = 0.84428071 + 0.590909091 x = 0.84428071 + 0.590909091 Combine like terms: 0.84428071 + 0.590909091 = 1.435189801 x = 1.435189801 Simplifying x = 1.435189801

Subproblem 2

x + -0.590909091 = -0.84428071 Simplifying x + -0.590909091 = -0.84428071 Reorder the terms: -0.590909091 + x = -0.84428071 Solving -0.590909091 + x = -0.84428071 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.590909091' to each side of the equation. -0.590909091 + 0.590909091 + x = -0.84428071 + 0.590909091 Combine like terms: -0.590909091 + 0.590909091 = 0.000000000 0.000000000 + x = -0.84428071 + 0.590909091 x = -0.84428071 + 0.590909091 Combine like terms: -0.84428071 + 0.590909091 = -0.253371619 x = -0.253371619 Simplifying x = -0.253371619

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.435189801, -0.253371619}

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