9x^2-19x+9=0

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


Simplifying
9x2 + -19x + 9 = 0

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

Solving
9 + -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'.
1 + -2.111111111x + x2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -2.111111111x + -1 + x2 = 0 + -1

Reorder the terms:
1 + -1 + -2.111111111x + x2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -2.111111111x + x2 = 0 + -1
-2.111111111x + x2 = 0 + -1

Combine like terms: 0 + -1 = -1
-2.111111111x + x2 = -1

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 = -1 + 1.114197532

Reorder the terms:
1.114197532 + -2.111111111x + x2 = -1 + 1.114197532

Combine like terms: -1 + 1.114197532 = 0.114197532
1.114197532 + -2.111111111x + x2 = 0.114197532

Factor a perfect square on the left side:
(x + -1.055555556)(x + -1.055555556) = 0.114197532

Calculate the square root of the right side: 0.337931253

Break this problem into two subproblems by setting 
(x + -1.055555556) equal to 0.337931253 and -0.337931253.

Subproblem 1

x + -1.055555556 = 0.337931253 Simplifying x + -1.055555556 = 0.337931253 Reorder the terms: -1.055555556 + x = 0.337931253 Solving -1.055555556 + x = 0.337931253 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 = 0.337931253 + 1.055555556 Combine like terms: -1.055555556 + 1.055555556 = 0.000000000 0.000000000 + x = 0.337931253 + 1.055555556 x = 0.337931253 + 1.055555556 Combine like terms: 0.337931253 + 1.055555556 = 1.393486809 x = 1.393486809 Simplifying x = 1.393486809

Subproblem 2

x + -1.055555556 = -0.337931253 Simplifying x + -1.055555556 = -0.337931253 Reorder the terms: -1.055555556 + x = -0.337931253 Solving -1.055555556 + x = -0.337931253 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 = -0.337931253 + 1.055555556 Combine like terms: -1.055555556 + 1.055555556 = 0.000000000 0.000000000 + x = -0.337931253 + 1.055555556 x = -0.337931253 + 1.055555556 Combine like terms: -0.337931253 + 1.055555556 = 0.717624303 x = 0.717624303 Simplifying x = 0.717624303

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.393486809, 0.717624303}

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