3x=x^2-8x-16

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Solution for 3x=x^2-8x-16 equation:


Simplifying
3x = x2 + -8x + -16

Reorder the terms:
3x = -16 + -8x + x2

Solving
3x = -16 + -8x + x2

Solving for variable 'x'.

Reorder the terms:
16 + 3x + 8x + -1x2 = -16 + -8x + x2 + 16 + 8x + -1x2

Combine like terms: 3x + 8x = 11x
16 + 11x + -1x2 = -16 + -8x + x2 + 16 + 8x + -1x2

Reorder the terms:
16 + 11x + -1x2 = -16 + 16 + -8x + 8x + x2 + -1x2

Combine like terms: -16 + 16 = 0
16 + 11x + -1x2 = 0 + -8x + 8x + x2 + -1x2
16 + 11x + -1x2 = -8x + 8x + x2 + -1x2

Combine like terms: -8x + 8x = 0
16 + 11x + -1x2 = 0 + x2 + -1x2
16 + 11x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
16 + 11x + -1x2 = 0

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

Divide each side by '-1'.
-16 + -11x + x2 = 0

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + -11x + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + -11x + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + -11x + x2 = 0 + 16
-11x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
-11x + x2 = 16

The x term is -11x.  Take half its coefficient (-5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
-11x + 30.25 + x2 = 16 + 30.25

Reorder the terms:
30.25 + -11x + x2 = 16 + 30.25

Combine like terms: 16 + 30.25 = 46.25
30.25 + -11x + x2 = 46.25

Factor a perfect square on the left side:
(x + -5.5)(x + -5.5) = 46.25

Calculate the square root of the right side: 6.800735254

Break this problem into two subproblems by setting 
(x + -5.5) equal to 6.800735254 and -6.800735254.

Subproblem 1

x + -5.5 = 6.800735254 Simplifying x + -5.5 = 6.800735254 Reorder the terms: -5.5 + x = 6.800735254 Solving -5.5 + x = 6.800735254 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + x = 6.800735254 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = 6.800735254 + 5.5 x = 6.800735254 + 5.5 Combine like terms: 6.800735254 + 5.5 = 12.300735254 x = 12.300735254 Simplifying x = 12.300735254

Subproblem 2

x + -5.5 = -6.800735254 Simplifying x + -5.5 = -6.800735254 Reorder the terms: -5.5 + x = -6.800735254 Solving -5.5 + x = -6.800735254 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + x = -6.800735254 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = -6.800735254 + 5.5 x = -6.800735254 + 5.5 Combine like terms: -6.800735254 + 5.5 = -1.300735254 x = -1.300735254 Simplifying x = -1.300735254

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.300735254, -1.300735254}

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