18x^2-11x-6=0

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Solution for 18x^2-11x-6=0 equation:


Simplifying
18x2 + -11x + -6 = 0

Reorder the terms:
-6 + -11x + 18x2 = 0

Solving
-6 + -11x + 18x2 = 0

Solving for variable 'x'.

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

Divide each side by '18'.
-0.3333333333 + -0.6111111111x + x2 = 0

Move the constant term to the right:

Add '0.3333333333' to each side of the equation.
-0.3333333333 + -0.6111111111x + 0.3333333333 + x2 = 0 + 0.3333333333

Reorder the terms:
-0.3333333333 + 0.3333333333 + -0.6111111111x + x2 = 0 + 0.3333333333

Combine like terms: -0.3333333333 + 0.3333333333 = 0.0000000000
0.0000000000 + -0.6111111111x + x2 = 0 + 0.3333333333
-0.6111111111x + x2 = 0 + 0.3333333333

Combine like terms: 0 + 0.3333333333 = 0.3333333333
-0.6111111111x + x2 = 0.3333333333

The x term is -0.6111111111x.  Take half its coefficient (-0.3055555556).
Square it (0.09336419756) and add it to both sides.

Add '0.09336419756' to each side of the equation.
-0.6111111111x + 0.09336419756 + x2 = 0.3333333333 + 0.09336419756

Reorder the terms:
0.09336419756 + -0.6111111111x + x2 = 0.3333333333 + 0.09336419756

Combine like terms: 0.3333333333 + 0.09336419756 = 0.42669753086
0.09336419756 + -0.6111111111x + x2 = 0.42669753086

Factor a perfect square on the left side:
(x + -0.3055555556)(x + -0.3055555556) = 0.42669753086

Calculate the square root of the right side: 0.65322089

Break this problem into two subproblems by setting 
(x + -0.3055555556) equal to 0.65322089 and -0.65322089.

Subproblem 1

x + -0.3055555556 = 0.65322089 Simplifying x + -0.3055555556 = 0.65322089 Reorder the terms: -0.3055555556 + x = 0.65322089 Solving -0.3055555556 + x = 0.65322089 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3055555556' to each side of the equation. -0.3055555556 + 0.3055555556 + x = 0.65322089 + 0.3055555556 Combine like terms: -0.3055555556 + 0.3055555556 = 0.0000000000 0.0000000000 + x = 0.65322089 + 0.3055555556 x = 0.65322089 + 0.3055555556 Combine like terms: 0.65322089 + 0.3055555556 = 0.9587764456 x = 0.9587764456 Simplifying x = 0.9587764456

Subproblem 2

x + -0.3055555556 = -0.65322089 Simplifying x + -0.3055555556 = -0.65322089 Reorder the terms: -0.3055555556 + x = -0.65322089 Solving -0.3055555556 + x = -0.65322089 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3055555556' to each side of the equation. -0.3055555556 + 0.3055555556 + x = -0.65322089 + 0.3055555556 Combine like terms: -0.3055555556 + 0.3055555556 = 0.0000000000 0.0000000000 + x = -0.65322089 + 0.3055555556 x = -0.65322089 + 0.3055555556 Combine like terms: -0.65322089 + 0.3055555556 = -0.3476653344 x = -0.3476653344 Simplifying x = -0.3476653344

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.9587764456, -0.3476653344}

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