9x^2+18x-55=6

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Solution for 9x^2+18x-55=6 equation:


Simplifying
9x2 + 18x + -55 = 6

Reorder the terms:
-55 + 18x + 9x2 = 6

Solving
-55 + 18x + 9x2 = 6

Solving for variable 'x'.

Reorder the terms:
-55 + -6 + 18x + 9x2 = 6 + -6

Combine like terms: -55 + -6 = -61
-61 + 18x + 9x2 = 6 + -6

Combine like terms: 6 + -6 = 0
-61 + 18x + 9x2 = 0

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

Divide each side by '9'.
-6.777777778 + 2x + x2 = 0

Move the constant term to the right:

Add '6.777777778' to each side of the equation.
-6.777777778 + 2x + 6.777777778 + x2 = 0 + 6.777777778

Reorder the terms:
-6.777777778 + 6.777777778 + 2x + x2 = 0 + 6.777777778

Combine like terms: -6.777777778 + 6.777777778 = 0.000000000
0.000000000 + 2x + x2 = 0 + 6.777777778
2x + x2 = 0 + 6.777777778

Combine like terms: 0 + 6.777777778 = 6.777777778
2x + x2 = 6.777777778

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 6.777777778 + 1

Reorder the terms:
1 + 2x + x2 = 6.777777778 + 1

Combine like terms: 6.777777778 + 1 = 7.777777778
1 + 2x + x2 = 7.777777778

Factor a perfect square on the left side:
(x + 1)(x + 1) = 7.777777778

Calculate the square root of the right side: 2.788866755

Break this problem into two subproblems by setting 
(x + 1) equal to 2.788866755 and -2.788866755.

Subproblem 1

x + 1 = 2.788866755 Simplifying x + 1 = 2.788866755 Reorder the terms: 1 + x = 2.788866755 Solving 1 + x = 2.788866755 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 2.788866755 + -1 Combine like terms: 1 + -1 = 0 0 + x = 2.788866755 + -1 x = 2.788866755 + -1 Combine like terms: 2.788866755 + -1 = 1.788866755 x = 1.788866755 Simplifying x = 1.788866755

Subproblem 2

x + 1 = -2.788866755 Simplifying x + 1 = -2.788866755 Reorder the terms: 1 + x = -2.788866755 Solving 1 + x = -2.788866755 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -2.788866755 + -1 Combine like terms: 1 + -1 = 0 0 + x = -2.788866755 + -1 x = -2.788866755 + -1 Combine like terms: -2.788866755 + -1 = -3.788866755 x = -3.788866755 Simplifying x = -3.788866755

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.788866755, -3.788866755}

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