9x^2-127x+386=0

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Solution for 9x^2-127x+386=0 equation:


Simplifying
9x2 + -127x + 386 = 0

Reorder the terms:
386 + -127x + 9x2 = 0

Solving
386 + -127x + 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'.
42.88888889 + -14.11111111x + x2 = 0

Move the constant term to the right:

Add '-42.88888889' to each side of the equation.
42.88888889 + -14.11111111x + -42.88888889 + x2 = 0 + -42.88888889

Reorder the terms:
42.88888889 + -42.88888889 + -14.11111111x + x2 = 0 + -42.88888889

Combine like terms: 42.88888889 + -42.88888889 = 0.00000000
0.00000000 + -14.11111111x + x2 = 0 + -42.88888889
-14.11111111x + x2 = 0 + -42.88888889

Combine like terms: 0 + -42.88888889 = -42.88888889
-14.11111111x + x2 = -42.88888889

The x term is -14.11111111x.  Take half its coefficient (-7.055555555).
Square it (49.78086419) and add it to both sides.

Add '49.78086419' to each side of the equation.
-14.11111111x + 49.78086419 + x2 = -42.88888889 + 49.78086419

Reorder the terms:
49.78086419 + -14.11111111x + x2 = -42.88888889 + 49.78086419

Combine like terms: -42.88888889 + 49.78086419 = 6.8919753
49.78086419 + -14.11111111x + x2 = 6.8919753

Factor a perfect square on the left side:
(x + -7.055555555)(x + -7.055555555) = 6.8919753

Calculate the square root of the right side: 2.625257187

Break this problem into two subproblems by setting 
(x + -7.055555555) equal to 2.625257187 and -2.625257187.

Subproblem 1

x + -7.055555555 = 2.625257187 Simplifying x + -7.055555555 = 2.625257187 Reorder the terms: -7.055555555 + x = 2.625257187 Solving -7.055555555 + x = 2.625257187 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.055555555' to each side of the equation. -7.055555555 + 7.055555555 + x = 2.625257187 + 7.055555555 Combine like terms: -7.055555555 + 7.055555555 = 0.000000000 0.000000000 + x = 2.625257187 + 7.055555555 x = 2.625257187 + 7.055555555 Combine like terms: 2.625257187 + 7.055555555 = 9.680812742 x = 9.680812742 Simplifying x = 9.680812742

Subproblem 2

x + -7.055555555 = -2.625257187 Simplifying x + -7.055555555 = -2.625257187 Reorder the terms: -7.055555555 + x = -2.625257187 Solving -7.055555555 + x = -2.625257187 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.055555555' to each side of the equation. -7.055555555 + 7.055555555 + x = -2.625257187 + 7.055555555 Combine like terms: -7.055555555 + 7.055555555 = 0.000000000 0.000000000 + x = -2.625257187 + 7.055555555 x = -2.625257187 + 7.055555555 Combine like terms: -2.625257187 + 7.055555555 = 4.430298368 x = 4.430298368 Simplifying x = 4.430298368

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.680812742, 4.430298368}

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