6x^2+55x-9=0

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


Simplifying
6x2 + 55x + -9 = 0

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

Solving
-9 + 55x + 6x2 = 0

Solving for variable 'x'.

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

Divide each side by '6'.
-1.5 + 9.166666667x + x2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + 9.166666667x + 1.5 + x2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + 9.166666667x + x2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + 9.166666667x + x2 = 0 + 1.5
9.166666667x + x2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
9.166666667x + x2 = 1.5

The x term is 9.166666667x.  Take half its coefficient (4.583333334).
Square it (21.00694445) and add it to both sides.

Add '21.00694445' to each side of the equation.
9.166666667x + 21.00694445 + x2 = 1.5 + 21.00694445

Reorder the terms:
21.00694445 + 9.166666667x + x2 = 1.5 + 21.00694445

Combine like terms: 1.5 + 21.00694445 = 22.50694445
21.00694445 + 9.166666667x + x2 = 22.50694445

Factor a perfect square on the left side:
(x + 4.583333334)(x + 4.583333334) = 22.50694445

Calculate the square root of the right side: 4.744148443

Break this problem into two subproblems by setting 
(x + 4.583333334) equal to 4.744148443 and -4.744148443.

Subproblem 1

x + 4.583333334 = 4.744148443 Simplifying x + 4.583333334 = 4.744148443 Reorder the terms: 4.583333334 + x = 4.744148443 Solving 4.583333334 + x = 4.744148443 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.583333334' to each side of the equation. 4.583333334 + -4.583333334 + x = 4.744148443 + -4.583333334 Combine like terms: 4.583333334 + -4.583333334 = 0.000000000 0.000000000 + x = 4.744148443 + -4.583333334 x = 4.744148443 + -4.583333334 Combine like terms: 4.744148443 + -4.583333334 = 0.160815109 x = 0.160815109 Simplifying x = 0.160815109

Subproblem 2

x + 4.583333334 = -4.744148443 Simplifying x + 4.583333334 = -4.744148443 Reorder the terms: 4.583333334 + x = -4.744148443 Solving 4.583333334 + x = -4.744148443 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.583333334' to each side of the equation. 4.583333334 + -4.583333334 + x = -4.744148443 + -4.583333334 Combine like terms: 4.583333334 + -4.583333334 = 0.000000000 0.000000000 + x = -4.744148443 + -4.583333334 x = -4.744148443 + -4.583333334 Combine like terms: -4.744148443 + -4.583333334 = -9.327481777 x = -9.327481777 Simplifying x = -9.327481777

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.160815109, -9.327481777}

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