11x^2-12x-18=0

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Solution for 11x^2-12x-18=0 equation:


Simplifying
11x2 + -12x + -18 = 0

Reorder the terms:
-18 + -12x + 11x2 = 0

Solving
-18 + -12x + 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'.
-1.636363636 + -1.090909091x + x2 = 0

Move the constant term to the right:

Add '1.636363636' to each side of the equation.
-1.636363636 + -1.090909091x + 1.636363636 + x2 = 0 + 1.636363636

Reorder the terms:
-1.636363636 + 1.636363636 + -1.090909091x + x2 = 0 + 1.636363636

Combine like terms: -1.636363636 + 1.636363636 = 0.000000000
0.000000000 + -1.090909091x + x2 = 0 + 1.636363636
-1.090909091x + x2 = 0 + 1.636363636

Combine like terms: 0 + 1.636363636 = 1.636363636
-1.090909091x + x2 = 1.636363636

The x term is -1.090909091x.  Take half its coefficient (-0.5454545455).
Square it (0.2975206612) and add it to both sides.

Add '0.2975206612' to each side of the equation.
-1.090909091x + 0.2975206612 + x2 = 1.636363636 + 0.2975206612

Reorder the terms:
0.2975206612 + -1.090909091x + x2 = 1.636363636 + 0.2975206612

Combine like terms: 1.636363636 + 0.2975206612 = 1.9338842972
0.2975206612 + -1.090909091x + x2 = 1.9338842972

Factor a perfect square on the left side:
(x + -0.5454545455)(x + -0.5454545455) = 1.9338842972

Calculate the square root of the right side: 1.390641685

Break this problem into two subproblems by setting 
(x + -0.5454545455) equal to 1.390641685 and -1.390641685.

Subproblem 1

x + -0.5454545455 = 1.390641685 Simplifying x + -0.5454545455 = 1.390641685 Reorder the terms: -0.5454545455 + x = 1.390641685 Solving -0.5454545455 + x = 1.390641685 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5454545455' to each side of the equation. -0.5454545455 + 0.5454545455 + x = 1.390641685 + 0.5454545455 Combine like terms: -0.5454545455 + 0.5454545455 = 0.0000000000 0.0000000000 + x = 1.390641685 + 0.5454545455 x = 1.390641685 + 0.5454545455 Combine like terms: 1.390641685 + 0.5454545455 = 1.9360962305 x = 1.9360962305 Simplifying x = 1.9360962305

Subproblem 2

x + -0.5454545455 = -1.390641685 Simplifying x + -0.5454545455 = -1.390641685 Reorder the terms: -0.5454545455 + x = -1.390641685 Solving -0.5454545455 + x = -1.390641685 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5454545455' to each side of the equation. -0.5454545455 + 0.5454545455 + x = -1.390641685 + 0.5454545455 Combine like terms: -0.5454545455 + 0.5454545455 = 0.0000000000 0.0000000000 + x = -1.390641685 + 0.5454545455 x = -1.390641685 + 0.5454545455 Combine like terms: -1.390641685 + 0.5454545455 = -0.8451871395 x = -0.8451871395 Simplifying x = -0.8451871395

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.9360962305, -0.8451871395}

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