9x^2-50x-39=0

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Solution for 9x^2-50x-39=0 equation:


Simplifying
9x2 + -50x + -39 = 0

Reorder the terms:
-39 + -50x + 9x2 = 0

Solving
-39 + -50x + 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'.
-4.333333333 + -5.555555556x + x2 = 0

Move the constant term to the right:

Add '4.333333333' to each side of the equation.
-4.333333333 + -5.555555556x + 4.333333333 + x2 = 0 + 4.333333333

Reorder the terms:
-4.333333333 + 4.333333333 + -5.555555556x + x2 = 0 + 4.333333333

Combine like terms: -4.333333333 + 4.333333333 = 0.000000000
0.000000000 + -5.555555556x + x2 = 0 + 4.333333333
-5.555555556x + x2 = 0 + 4.333333333

Combine like terms: 0 + 4.333333333 = 4.333333333
-5.555555556x + x2 = 4.333333333

The x term is -5.555555556x.  Take half its coefficient (-2.777777778).
Square it (7.716049384) and add it to both sides.

Add '7.716049384' to each side of the equation.
-5.555555556x + 7.716049384 + x2 = 4.333333333 + 7.716049384

Reorder the terms:
7.716049384 + -5.555555556x + x2 = 4.333333333 + 7.716049384

Combine like terms: 4.333333333 + 7.716049384 = 12.049382717
7.716049384 + -5.555555556x + x2 = 12.049382717

Factor a perfect square on the left side:
(x + -2.777777778)(x + -2.777777778) = 12.049382717

Calculate the square root of the right side: 3.471222078

Break this problem into two subproblems by setting 
(x + -2.777777778) equal to 3.471222078 and -3.471222078.

Subproblem 1

x + -2.777777778 = 3.471222078 Simplifying x + -2.777777778 = 3.471222078 Reorder the terms: -2.777777778 + x = 3.471222078 Solving -2.777777778 + x = 3.471222078 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.777777778' to each side of the equation. -2.777777778 + 2.777777778 + x = 3.471222078 + 2.777777778 Combine like terms: -2.777777778 + 2.777777778 = 0.000000000 0.000000000 + x = 3.471222078 + 2.777777778 x = 3.471222078 + 2.777777778 Combine like terms: 3.471222078 + 2.777777778 = 6.248999856 x = 6.248999856 Simplifying x = 6.248999856

Subproblem 2

x + -2.777777778 = -3.471222078 Simplifying x + -2.777777778 = -3.471222078 Reorder the terms: -2.777777778 + x = -3.471222078 Solving -2.777777778 + x = -3.471222078 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.777777778' to each side of the equation. -2.777777778 + 2.777777778 + x = -3.471222078 + 2.777777778 Combine like terms: -2.777777778 + 2.777777778 = 0.000000000 0.000000000 + x = -3.471222078 + 2.777777778 x = -3.471222078 + 2.777777778 Combine like terms: -3.471222078 + 2.777777778 = -0.6934443 x = -0.6934443 Simplifying x = -0.6934443

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.248999856, -0.6934443}

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