9x^2-125x+80=0

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Solution for 9x^2-125x+80=0 equation:


Simplifying
9x2 + -125x + 80 = 0

Reorder the terms:
80 + -125x + 9x2 = 0

Solving
80 + -125x + 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'.
8.888888889 + -13.88888889x + x2 = 0

Move the constant term to the right:

Add '-8.888888889' to each side of the equation.
8.888888889 + -13.88888889x + -8.888888889 + x2 = 0 + -8.888888889

Reorder the terms:
8.888888889 + -8.888888889 + -13.88888889x + x2 = 0 + -8.888888889

Combine like terms: 8.888888889 + -8.888888889 = 0.000000000
0.000000000 + -13.88888889x + x2 = 0 + -8.888888889
-13.88888889x + x2 = 0 + -8.888888889

Combine like terms: 0 + -8.888888889 = -8.888888889
-13.88888889x + x2 = -8.888888889

The x term is -13.88888889x.  Take half its coefficient (-6.944444445).
Square it (48.22530865) and add it to both sides.

Add '48.22530865' to each side of the equation.
-13.88888889x + 48.22530865 + x2 = -8.888888889 + 48.22530865

Reorder the terms:
48.22530865 + -13.88888889x + x2 = -8.888888889 + 48.22530865

Combine like terms: -8.888888889 + 48.22530865 = 39.336419761
48.22530865 + -13.88888889x + x2 = 39.336419761

Factor a perfect square on the left side:
(x + -6.944444445)(x + -6.944444445) = 39.336419761

Calculate the square root of the right side: 6.271875299

Break this problem into two subproblems by setting 
(x + -6.944444445) equal to 6.271875299 and -6.271875299.

Subproblem 1

x + -6.944444445 = 6.271875299 Simplifying x + -6.944444445 = 6.271875299 Reorder the terms: -6.944444445 + x = 6.271875299 Solving -6.944444445 + x = 6.271875299 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.944444445' to each side of the equation. -6.944444445 + 6.944444445 + x = 6.271875299 + 6.944444445 Combine like terms: -6.944444445 + 6.944444445 = 0.000000000 0.000000000 + x = 6.271875299 + 6.944444445 x = 6.271875299 + 6.944444445 Combine like terms: 6.271875299 + 6.944444445 = 13.216319744 x = 13.216319744 Simplifying x = 13.216319744

Subproblem 2

x + -6.944444445 = -6.271875299 Simplifying x + -6.944444445 = -6.271875299 Reorder the terms: -6.944444445 + x = -6.271875299 Solving -6.944444445 + x = -6.271875299 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.944444445' to each side of the equation. -6.944444445 + 6.944444445 + x = -6.271875299 + 6.944444445 Combine like terms: -6.944444445 + 6.944444445 = 0.000000000 0.000000000 + x = -6.271875299 + 6.944444445 x = -6.271875299 + 6.944444445 Combine like terms: -6.271875299 + 6.944444445 = 0.672569146 x = 0.672569146 Simplifying x = 0.672569146

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.216319744, 0.672569146}

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