9x^2+55x-6=0

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Solution for 9x^2+55x-6=0 equation:


Simplifying
9x2 + 55x + -6 = 0

Reorder the terms:
-6 + 55x + 9x2 = 0

Solving
-6 + 55x + 9x2 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
-0.6666666667 + 6.111111111x + x2 = 0

Move the constant term to the right:

Add '0.6666666667' to each side of the equation.
-0.6666666667 + 6.111111111x + 0.6666666667 + x2 = 0 + 0.6666666667

Reorder the terms:
-0.6666666667 + 0.6666666667 + 6.111111111x + x2 = 0 + 0.6666666667

Combine like terms: -0.6666666667 + 0.6666666667 = 0.0000000000
0.0000000000 + 6.111111111x + x2 = 0 + 0.6666666667
6.111111111x + x2 = 0 + 0.6666666667

Combine like terms: 0 + 0.6666666667 = 0.6666666667
6.111111111x + x2 = 0.6666666667

The x term is 6.111111111x.  Take half its coefficient (3.055555556).
Square it (9.336419756) and add it to both sides.

Add '9.336419756' to each side of the equation.
6.111111111x + 9.336419756 + x2 = 0.6666666667 + 9.336419756

Reorder the terms:
9.336419756 + 6.111111111x + x2 = 0.6666666667 + 9.336419756

Combine like terms: 0.6666666667 + 9.336419756 = 10.0030864227
9.336419756 + 6.111111111x + x2 = 10.0030864227

Factor a perfect square on the left side:
(x + 3.055555556)(x + 3.055555556) = 10.0030864227

Calculate the square root of the right side: 3.162765629

Break this problem into two subproblems by setting 
(x + 3.055555556) equal to 3.162765629 and -3.162765629.

Subproblem 1

x + 3.055555556 = 3.162765629 Simplifying x + 3.055555556 = 3.162765629 Reorder the terms: 3.055555556 + x = 3.162765629 Solving 3.055555556 + x = 3.162765629 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.055555556' to each side of the equation. 3.055555556 + -3.055555556 + x = 3.162765629 + -3.055555556 Combine like terms: 3.055555556 + -3.055555556 = 0.000000000 0.000000000 + x = 3.162765629 + -3.055555556 x = 3.162765629 + -3.055555556 Combine like terms: 3.162765629 + -3.055555556 = 0.107210073 x = 0.107210073 Simplifying x = 0.107210073

Subproblem 2

x + 3.055555556 = -3.162765629 Simplifying x + 3.055555556 = -3.162765629 Reorder the terms: 3.055555556 + x = -3.162765629 Solving 3.055555556 + x = -3.162765629 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.055555556' to each side of the equation. 3.055555556 + -3.055555556 + x = -3.162765629 + -3.055555556 Combine like terms: 3.055555556 + -3.055555556 = 0.000000000 0.000000000 + x = -3.162765629 + -3.055555556 x = -3.162765629 + -3.055555556 Combine like terms: -3.162765629 + -3.055555556 = -6.218321185 x = -6.218321185 Simplifying x = -6.218321185

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.107210073, -6.218321185}

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