9x^2-18x+81=78

Solution for 9x^2-18x+81=78 equation:

Simplifying
9x2 + -18x + 81 = 78

Reorder the terms:
81 + -18x + 9x2 = 78

Solving
81 + -18x + 9x2 = 78

Solving for variable 'x'.

Reorder the terms:
81 + -78 + -18x + 9x2 = 78 + -78

Combine like terms: 81 + -78 = 3
3 + -18x + 9x2 = 78 + -78

Combine like terms: 78 + -78 = 0
3 + -18x + 9x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(1 + -6x + 3x2) = 0

Ignore the factor 3.
Subproblem 1
Set the factor '(1 + -6x + 3x2)' equal to zero and attempt to solve:

Simplifying
1 + -6x + 3x2 = 0

Solving
1 + -6x + 3x2 = 0

Begin completing the square.  Divide all terms by
3 the coefficient of the squared term: 

Divide each side by '3'.
0.3333333333 + -2x + x2 = 0

Move the constant term to the right:

Add '-0.3333333333' to each side of the equation.
0.3333333333 + -2x + -0.3333333333 + x2 = 0 + -0.3333333333

Reorder the terms:
0.3333333333 + -0.3333333333 + -2x + x2 = 0 + -0.3333333333

Combine like terms: 0.3333333333 + -0.3333333333 = 0.0000000000
0.0000000000 + -2x + x2 = 0 + -0.3333333333
-2x + x2 = 0 + -0.3333333333

Combine like terms: 0 + -0.3333333333 = -0.3333333333
-2x + x2 = -0.3333333333

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = -0.3333333333 + 1

Reorder the terms:
1 + -2x + x2 = -0.3333333333 + 1

Combine like terms: -0.3333333333 + 1 = 0.6666666667
1 + -2x + x2 = 0.6666666667

Factor a perfect square on the left side:
(x + -1)(x + -1) = 0.6666666667

Calculate the square root of the right side: 0.816496581

Break this problem into two subproblems by setting 
(x + -1) equal to 0.816496581 and -0.816496581.

Subproblem 1
x + -1 = 0.816496581

Simplifying
x + -1 = 0.816496581

Reorder the terms:
-1 + x = 0.816496581

Solving
-1 + x = 0.816496581

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '1' to each side of the equation.
-1 + 1 + x = 0.816496581 + 1

Combine like terms: -1 + 1 = 0
0 + x = 0.816496581 + 1
x = 0.816496581 + 1

Combine like terms: 0.816496581 + 1 = 1.816496581
x = 1.816496581

Simplifying
x = 1.816496581

Subproblem 2
x + -1 = -0.816496581

Simplifying
x + -1 = -0.816496581

Reorder the terms:
-1 + x = -0.816496581

Solving
-1 + x = -0.816496581

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '1' to each side of the equation.
-1 + 1 + x = -0.816496581 + 1

Combine like terms: -1 + 1 = 0
0 + x = -0.816496581 + 1
x = -0.816496581 + 1

Combine like terms: -0.816496581 + 1 = 0.183503419
x = 0.183503419

Simplifying
x = 0.183503419

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {1.816496581, 0.183503419}
Solution
x = {1.816496581, 0.183503419}