9x^2-7x-6=0

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Solution for 9x^2-7x-6=0 equation:


Simplifying
9x2 + -7x + -6 = 0

Reorder the terms:
-6 + -7x + 9x2 = 0

Solving
-6 + -7x + 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 + -0.7777777778x + x2 = 0

Move the constant term to the right:

Add '0.6666666667' to each side of the equation.
-0.6666666667 + -0.7777777778x + 0.6666666667 + x2 = 0 + 0.6666666667

Reorder the terms:
-0.6666666667 + 0.6666666667 + -0.7777777778x + x2 = 0 + 0.6666666667

Combine like terms: -0.6666666667 + 0.6666666667 = 0.0000000000
0.0000000000 + -0.7777777778x + x2 = 0 + 0.6666666667
-0.7777777778x + x2 = 0 + 0.6666666667

Combine like terms: 0 + 0.6666666667 = 0.6666666667
-0.7777777778x + x2 = 0.6666666667

The x term is -0.7777777778x.  Take half its coefficient (-0.3888888889).
Square it (0.1512345679) and add it to both sides.

Add '0.1512345679' to each side of the equation.
-0.7777777778x + 0.1512345679 + x2 = 0.6666666667 + 0.1512345679

Reorder the terms:
0.1512345679 + -0.7777777778x + x2 = 0.6666666667 + 0.1512345679

Combine like terms: 0.6666666667 + 0.1512345679 = 0.8179012346
0.1512345679 + -0.7777777778x + x2 = 0.8179012346

Factor a perfect square on the left side:
(x + -0.3888888889)(x + -0.3888888889) = 0.8179012346

Calculate the square root of the right side: 0.904378922

Break this problem into two subproblems by setting 
(x + -0.3888888889) equal to 0.904378922 and -0.904378922.

Subproblem 1

x + -0.3888888889 = 0.904378922 Simplifying x + -0.3888888889 = 0.904378922 Reorder the terms: -0.3888888889 + x = 0.904378922 Solving -0.3888888889 + x = 0.904378922 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3888888889' to each side of the equation. -0.3888888889 + 0.3888888889 + x = 0.904378922 + 0.3888888889 Combine like terms: -0.3888888889 + 0.3888888889 = 0.0000000000 0.0000000000 + x = 0.904378922 + 0.3888888889 x = 0.904378922 + 0.3888888889 Combine like terms: 0.904378922 + 0.3888888889 = 1.2932678109 x = 1.2932678109 Simplifying x = 1.2932678109

Subproblem 2

x + -0.3888888889 = -0.904378922 Simplifying x + -0.3888888889 = -0.904378922 Reorder the terms: -0.3888888889 + x = -0.904378922 Solving -0.3888888889 + x = -0.904378922 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3888888889' to each side of the equation. -0.3888888889 + 0.3888888889 + x = -0.904378922 + 0.3888888889 Combine like terms: -0.3888888889 + 0.3888888889 = 0.0000000000 0.0000000000 + x = -0.904378922 + 0.3888888889 x = -0.904378922 + 0.3888888889 Combine like terms: -0.904378922 + 0.3888888889 = -0.5154900331 x = -0.5154900331 Simplifying x = -0.5154900331

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.2932678109, -0.5154900331}

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