9x^2-128x+64=0

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Solution for 9x^2-128x+64=0 equation:


Simplifying
9x2 + -128x + 64 = 0

Reorder the terms:
64 + -128x + 9x2 = 0

Solving
64 + -128x + 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'.
7.111111111 + -14.22222222x + x2 = 0

Move the constant term to the right:

Add '-7.111111111' to each side of the equation.
7.111111111 + -14.22222222x + -7.111111111 + x2 = 0 + -7.111111111

Reorder the terms:
7.111111111 + -7.111111111 + -14.22222222x + x2 = 0 + -7.111111111

Combine like terms: 7.111111111 + -7.111111111 = 0.000000000
0.000000000 + -14.22222222x + x2 = 0 + -7.111111111
-14.22222222x + x2 = 0 + -7.111111111

Combine like terms: 0 + -7.111111111 = -7.111111111
-14.22222222x + x2 = -7.111111111

The x term is -14.22222222x.  Take half its coefficient (-7.11111111).
Square it (50.56790122) and add it to both sides.

Add '50.56790122' to each side of the equation.
-14.22222222x + 50.56790122 + x2 = -7.111111111 + 50.56790122

Reorder the terms:
50.56790122 + -14.22222222x + x2 = -7.111111111 + 50.56790122

Combine like terms: -7.111111111 + 50.56790122 = 43.456790109
50.56790122 + -14.22222222x + x2 = 43.456790109

Factor a perfect square on the left side:
(x + -7.11111111)(x + -7.11111111) = 43.456790109

Calculate the square root of the right side: 6.592176432

Break this problem into two subproblems by setting 
(x + -7.11111111) equal to 6.592176432 and -6.592176432.

Subproblem 1

x + -7.11111111 = 6.592176432 Simplifying x + -7.11111111 = 6.592176432 Reorder the terms: -7.11111111 + x = 6.592176432 Solving -7.11111111 + x = 6.592176432 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.11111111' to each side of the equation. -7.11111111 + 7.11111111 + x = 6.592176432 + 7.11111111 Combine like terms: -7.11111111 + 7.11111111 = 0.00000000 0.00000000 + x = 6.592176432 + 7.11111111 x = 6.592176432 + 7.11111111 Combine like terms: 6.592176432 + 7.11111111 = 13.703287542 x = 13.703287542 Simplifying x = 13.703287542

Subproblem 2

x + -7.11111111 = -6.592176432 Simplifying x + -7.11111111 = -6.592176432 Reorder the terms: -7.11111111 + x = -6.592176432 Solving -7.11111111 + x = -6.592176432 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.11111111' to each side of the equation. -7.11111111 + 7.11111111 + x = -6.592176432 + 7.11111111 Combine like terms: -7.11111111 + 7.11111111 = 0.00000000 0.00000000 + x = -6.592176432 + 7.11111111 x = -6.592176432 + 7.11111111 Combine like terms: -6.592176432 + 7.11111111 = 0.518934678 x = 0.518934678 Simplifying x = 0.518934678

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.703287542, 0.518934678}

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