9x^2-19x-8=0

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Solution for 9x^2-19x-8=0 equation:


Simplifying
9x2 + -19x + -8 = 0

Reorder the terms:
-8 + -19x + 9x2 = 0

Solving
-8 + -19x + 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'.
-0.8888888889 + -2.111111111x + x2 = 0

Move the constant term to the right:

Add '0.8888888889' to each side of the equation.
-0.8888888889 + -2.111111111x + 0.8888888889 + x2 = 0 + 0.8888888889

Reorder the terms:
-0.8888888889 + 0.8888888889 + -2.111111111x + x2 = 0 + 0.8888888889

Combine like terms: -0.8888888889 + 0.8888888889 = 0.0000000000
0.0000000000 + -2.111111111x + x2 = 0 + 0.8888888889
-2.111111111x + x2 = 0 + 0.8888888889

Combine like terms: 0 + 0.8888888889 = 0.8888888889
-2.111111111x + x2 = 0.8888888889

The x term is -2.111111111x.  Take half its coefficient (-1.055555556).
Square it (1.114197532) and add it to both sides.

Add '1.114197532' to each side of the equation.
-2.111111111x + 1.114197532 + x2 = 0.8888888889 + 1.114197532

Reorder the terms:
1.114197532 + -2.111111111x + x2 = 0.8888888889 + 1.114197532

Combine like terms: 0.8888888889 + 1.114197532 = 2.0030864209
1.114197532 + -2.111111111x + x2 = 2.0030864209

Factor a perfect square on the left side:
(x + -1.055555556)(x + -1.055555556) = 2.0030864209

Calculate the square root of the right side: 1.415304356

Break this problem into two subproblems by setting 
(x + -1.055555556) equal to 1.415304356 and -1.415304356.

Subproblem 1

x + -1.055555556 = 1.415304356 Simplifying x + -1.055555556 = 1.415304356 Reorder the terms: -1.055555556 + x = 1.415304356 Solving -1.055555556 + x = 1.415304356 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.055555556' to each side of the equation. -1.055555556 + 1.055555556 + x = 1.415304356 + 1.055555556 Combine like terms: -1.055555556 + 1.055555556 = 0.000000000 0.000000000 + x = 1.415304356 + 1.055555556 x = 1.415304356 + 1.055555556 Combine like terms: 1.415304356 + 1.055555556 = 2.470859912 x = 2.470859912 Simplifying x = 2.470859912

Subproblem 2

x + -1.055555556 = -1.415304356 Simplifying x + -1.055555556 = -1.415304356 Reorder the terms: -1.055555556 + x = -1.415304356 Solving -1.055555556 + x = -1.415304356 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.055555556' to each side of the equation. -1.055555556 + 1.055555556 + x = -1.415304356 + 1.055555556 Combine like terms: -1.055555556 + 1.055555556 = 0.000000000 0.000000000 + x = -1.415304356 + 1.055555556 x = -1.415304356 + 1.055555556 Combine like terms: -1.415304356 + 1.055555556 = -0.3597488 x = -0.3597488 Simplifying x = -0.3597488

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.470859912, -0.3597488}

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