9x^2-64x+75=0

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Solution for 9x^2-64x+75=0 equation:


Simplifying
9x2 + -64x + 75 = 0

Reorder the terms:
75 + -64x + 9x2 = 0

Solving
75 + -64x + 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'.
8.333333333 + -7.111111111x + x2 = 0

Move the constant term to the right:

Add '-8.333333333' to each side of the equation.
8.333333333 + -7.111111111x + -8.333333333 + x2 = 0 + -8.333333333

Reorder the terms:
8.333333333 + -8.333333333 + -7.111111111x + x2 = 0 + -8.333333333

Combine like terms: 8.333333333 + -8.333333333 = 0.000000000
0.000000000 + -7.111111111x + x2 = 0 + -8.333333333
-7.111111111x + x2 = 0 + -8.333333333

Combine like terms: 0 + -8.333333333 = -8.333333333
-7.111111111x + x2 = -8.333333333

The x term is -7.111111111x.  Take half its coefficient (-3.555555556).
Square it (12.64197531) and add it to both sides.

Add '12.64197531' to each side of the equation.
-7.111111111x + 12.64197531 + x2 = -8.333333333 + 12.64197531

Reorder the terms:
12.64197531 + -7.111111111x + x2 = -8.333333333 + 12.64197531

Combine like terms: -8.333333333 + 12.64197531 = 4.308641977
12.64197531 + -7.111111111x + x2 = 4.308641977

Factor a perfect square on the left side:
(x + -3.555555556)(x + -3.555555556) = 4.308641977

Calculate the square root of the right side: 2.075726855

Break this problem into two subproblems by setting 
(x + -3.555555556) equal to 2.075726855 and -2.075726855.

Subproblem 1

x + -3.555555556 = 2.075726855 Simplifying x + -3.555555556 = 2.075726855 Reorder the terms: -3.555555556 + x = 2.075726855 Solving -3.555555556 + x = 2.075726855 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.555555556' to each side of the equation. -3.555555556 + 3.555555556 + x = 2.075726855 + 3.555555556 Combine like terms: -3.555555556 + 3.555555556 = 0.000000000 0.000000000 + x = 2.075726855 + 3.555555556 x = 2.075726855 + 3.555555556 Combine like terms: 2.075726855 + 3.555555556 = 5.631282411 x = 5.631282411 Simplifying x = 5.631282411

Subproblem 2

x + -3.555555556 = -2.075726855 Simplifying x + -3.555555556 = -2.075726855 Reorder the terms: -3.555555556 + x = -2.075726855 Solving -3.555555556 + x = -2.075726855 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.555555556' to each side of the equation. -3.555555556 + 3.555555556 + x = -2.075726855 + 3.555555556 Combine like terms: -3.555555556 + 3.555555556 = 0.000000000 0.000000000 + x = -2.075726855 + 3.555555556 x = -2.075726855 + 3.555555556 Combine like terms: -2.075726855 + 3.555555556 = 1.479828701 x = 1.479828701 Simplifying x = 1.479828701

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.631282411, 1.479828701}

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