9x^2-20x+9=0

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Solution for 9x^2-20x+9=0 equation:


Simplifying
9x2 + -20x + 9 = 0

Reorder the terms:
9 + -20x + 9x2 = 0

Solving
9 + -20x + 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 + -2.222222222x + x2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -2.222222222x + -1 + x2 = 0 + -1

Reorder the terms:
1 + -1 + -2.222222222x + x2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -2.222222222x + x2 = 0 + -1
-2.222222222x + x2 = 0 + -1

Combine like terms: 0 + -1 = -1
-2.222222222x + x2 = -1

The x term is -2.222222222x.  Take half its coefficient (-1.111111111).
Square it (1.234567901) and add it to both sides.

Add '1.234567901' to each side of the equation.
-2.222222222x + 1.234567901 + x2 = -1 + 1.234567901

Reorder the terms:
1.234567901 + -2.222222222x + x2 = -1 + 1.234567901

Combine like terms: -1 + 1.234567901 = 0.234567901
1.234567901 + -2.222222222x + x2 = 0.234567901

Factor a perfect square on the left side:
(x + -1.111111111)(x + -1.111111111) = 0.234567901

Calculate the square root of the right side: 0.484322105

Break this problem into two subproblems by setting 
(x + -1.111111111) equal to 0.484322105 and -0.484322105.

Subproblem 1

x + -1.111111111 = 0.484322105 Simplifying x + -1.111111111 = 0.484322105 Reorder the terms: -1.111111111 + x = 0.484322105 Solving -1.111111111 + x = 0.484322105 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.111111111' to each side of the equation. -1.111111111 + 1.111111111 + x = 0.484322105 + 1.111111111 Combine like terms: -1.111111111 + 1.111111111 = 0.000000000 0.000000000 + x = 0.484322105 + 1.111111111 x = 0.484322105 + 1.111111111 Combine like terms: 0.484322105 + 1.111111111 = 1.595433216 x = 1.595433216 Simplifying x = 1.595433216

Subproblem 2

x + -1.111111111 = -0.484322105 Simplifying x + -1.111111111 = -0.484322105 Reorder the terms: -1.111111111 + x = -0.484322105 Solving -1.111111111 + x = -0.484322105 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.111111111' to each side of the equation. -1.111111111 + 1.111111111 + x = -0.484322105 + 1.111111111 Combine like terms: -1.111111111 + 1.111111111 = 0.000000000 0.000000000 + x = -0.484322105 + 1.111111111 x = -0.484322105 + 1.111111111 Combine like terms: -0.484322105 + 1.111111111 = 0.626789006 x = 0.626789006 Simplifying x = 0.626789006

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.595433216, 0.626789006}

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