x=x^2-8x+16

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Solution for x=x^2-8x+16 equation:


Simplifying
x = x2 + -8x + 16

Reorder the terms:
x = 16 + -8x + x2

Solving
x = 16 + -8x + x2

Solving for variable 'x'.

Reorder the terms:
-16 + x + 8x + -1x2 = 16 + -8x + x2 + -16 + 8x + -1x2

Combine like terms: x + 8x = 9x
-16 + 9x + -1x2 = 16 + -8x + x2 + -16 + 8x + -1x2

Reorder the terms:
-16 + 9x + -1x2 = 16 + -16 + -8x + 8x + x2 + -1x2

Combine like terms: 16 + -16 = 0
-16 + 9x + -1x2 = 0 + -8x + 8x + x2 + -1x2
-16 + 9x + -1x2 = -8x + 8x + x2 + -1x2

Combine like terms: -8x + 8x = 0
-16 + 9x + -1x2 = 0 + x2 + -1x2
-16 + 9x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-16 + 9x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
16 + -9x + x2 = 0

Move the constant term to the right:

Add '-16' to each side of the equation.
16 + -9x + -16 + x2 = 0 + -16

Reorder the terms:
16 + -16 + -9x + x2 = 0 + -16

Combine like terms: 16 + -16 = 0
0 + -9x + x2 = 0 + -16
-9x + x2 = 0 + -16

Combine like terms: 0 + -16 = -16
-9x + x2 = -16

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 = -16 + 20.25

Reorder the terms:
20.25 + -9x + x2 = -16 + 20.25

Combine like terms: -16 + 20.25 = 4.25
20.25 + -9x + x2 = 4.25

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = 4.25

Calculate the square root of the right side: 2.061552813

Break this problem into two subproblems by setting 
(x + -4.5) equal to 2.061552813 and -2.061552813.

Subproblem 1

x + -4.5 = 2.061552813 Simplifying x + -4.5 = 2.061552813 Reorder the terms: -4.5 + x = 2.061552813 Solving -4.5 + x = 2.061552813 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 = 2.061552813 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 2.061552813 + 4.5 x = 2.061552813 + 4.5 Combine like terms: 2.061552813 + 4.5 = 6.561552813 x = 6.561552813 Simplifying x = 6.561552813

Subproblem 2

x + -4.5 = -2.061552813 Simplifying x + -4.5 = -2.061552813 Reorder the terms: -4.5 + x = -2.061552813 Solving -4.5 + x = -2.061552813 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 = -2.061552813 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -2.061552813 + 4.5 x = -2.061552813 + 4.5 Combine like terms: -2.061552813 + 4.5 = 2.438447187 x = 2.438447187 Simplifying x = 2.438447187

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.561552813, 2.438447187}

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