8x^2-72x+27=0

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Solution for 8x^2-72x+27=0 equation:


Simplifying
8x2 + -72x + 27 = 0

Reorder the terms:
27 + -72x + 8x2 = 0

Solving
27 + -72x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
3.375 + -9x + x2 = 0

Move the constant term to the right:

Add '-3.375' to each side of the equation.
3.375 + -9x + -3.375 + x2 = 0 + -3.375

Reorder the terms:
3.375 + -3.375 + -9x + x2 = 0 + -3.375

Combine like terms: 3.375 + -3.375 = 0.000
0.000 + -9x + x2 = 0 + -3.375
-9x + x2 = 0 + -3.375

Combine like terms: 0 + -3.375 = -3.375
-9x + x2 = -3.375

The x term is -9x.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9x + 20.25 + x2 = -3.375 + 20.25

Reorder the terms:
20.25 + -9x + x2 = -3.375 + 20.25

Combine like terms: -3.375 + 20.25 = 16.875
20.25 + -9x + x2 = 16.875

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = 16.875

Calculate the square root of the right side: 4.107919181

Break this problem into two subproblems by setting 
(x + -4.5) equal to 4.107919181 and -4.107919181.

Subproblem 1

x + -4.5 = 4.107919181 Simplifying x + -4.5 = 4.107919181 Reorder the terms: -4.5 + x = 4.107919181 Solving -4.5 + x = 4.107919181 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = 4.107919181 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 4.107919181 + 4.5 x = 4.107919181 + 4.5 Combine like terms: 4.107919181 + 4.5 = 8.607919181 x = 8.607919181 Simplifying x = 8.607919181

Subproblem 2

x + -4.5 = -4.107919181 Simplifying x + -4.5 = -4.107919181 Reorder the terms: -4.5 + x = -4.107919181 Solving -4.5 + x = -4.107919181 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = -4.107919181 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -4.107919181 + 4.5 x = -4.107919181 + 4.5 Combine like terms: -4.107919181 + 4.5 = 0.392080819 x = 0.392080819 Simplifying x = 0.392080819

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.607919181, 0.392080819}

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