9x^2+38x+8=x

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Solution for 9x^2+38x+8=x equation:


Simplifying
9x2 + 38x + 8 = x

Reorder the terms:
8 + 38x + 9x2 = x

Solving
8 + 38x + 9x2 = x

Solving for variable 'x'.

Reorder the terms:
8 + 38x + -1x + 9x2 = x + -1x

Combine like terms: 38x + -1x = 37x
8 + 37x + 9x2 = x + -1x

Combine like terms: x + -1x = 0
8 + 37x + 9x2 = 0

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

Divide each side by '9'.
0.8888888889 + 4.111111111x + x2 = 0

Move the constant term to the right:

Add '-0.8888888889' to each side of the equation.
0.8888888889 + 4.111111111x + -0.8888888889 + x2 = 0 + -0.8888888889

Reorder the terms:
0.8888888889 + -0.8888888889 + 4.111111111x + x2 = 0 + -0.8888888889

Combine like terms: 0.8888888889 + -0.8888888889 = 0.0000000000
0.0000000000 + 4.111111111x + x2 = 0 + -0.8888888889
4.111111111x + x2 = 0 + -0.8888888889

Combine like terms: 0 + -0.8888888889 = -0.8888888889
4.111111111x + x2 = -0.8888888889

The x term is 4.111111111x.  Take half its coefficient (2.055555556).
Square it (4.225308644) and add it to both sides.

Add '4.225308644' to each side of the equation.
4.111111111x + 4.225308644 + x2 = -0.8888888889 + 4.225308644

Reorder the terms:
4.225308644 + 4.111111111x + x2 = -0.8888888889 + 4.225308644

Combine like terms: -0.8888888889 + 4.225308644 = 3.3364197551
4.225308644 + 4.111111111x + x2 = 3.3364197551

Factor a perfect square on the left side:
(x + 2.055555556)(x + 2.055555556) = 3.3364197551

Calculate the square root of the right side: 1.826586914

Break this problem into two subproblems by setting 
(x + 2.055555556) equal to 1.826586914 and -1.826586914.

Subproblem 1

x + 2.055555556 = 1.826586914 Simplifying x + 2.055555556 = 1.826586914 Reorder the terms: 2.055555556 + x = 1.826586914 Solving 2.055555556 + x = 1.826586914 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.055555556' to each side of the equation. 2.055555556 + -2.055555556 + x = 1.826586914 + -2.055555556 Combine like terms: 2.055555556 + -2.055555556 = 0.000000000 0.000000000 + x = 1.826586914 + -2.055555556 x = 1.826586914 + -2.055555556 Combine like terms: 1.826586914 + -2.055555556 = -0.228968642 x = -0.228968642 Simplifying x = -0.228968642

Subproblem 2

x + 2.055555556 = -1.826586914 Simplifying x + 2.055555556 = -1.826586914 Reorder the terms: 2.055555556 + x = -1.826586914 Solving 2.055555556 + x = -1.826586914 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.055555556' to each side of the equation. 2.055555556 + -2.055555556 + x = -1.826586914 + -2.055555556 Combine like terms: 2.055555556 + -2.055555556 = 0.000000000 0.000000000 + x = -1.826586914 + -2.055555556 x = -1.826586914 + -2.055555556 Combine like terms: -1.826586914 + -2.055555556 = -3.88214247 x = -3.88214247 Simplifying x = -3.88214247

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.228968642, -3.88214247}

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