0=x^2-16x-64

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Solution for 0=x^2-16x-64 equation:


Simplifying
0 = x2 + -16x + -64

Reorder the terms:
0 = -64 + -16x + x2

Solving
0 = -64 + -16x + x2

Solving for variable 'x'.

Combine like terms: 0 + 64 = 64
64 + 16x + -1x2 = -64 + -16x + x2 + 64 + 16x + -1x2

Reorder the terms:
64 + 16x + -1x2 = -64 + 64 + -16x + 16x + x2 + -1x2

Combine like terms: -64 + 64 = 0
64 + 16x + -1x2 = 0 + -16x + 16x + x2 + -1x2
64 + 16x + -1x2 = -16x + 16x + x2 + -1x2

Combine like terms: -16x + 16x = 0
64 + 16x + -1x2 = 0 + x2 + -1x2
64 + 16x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
64 + 16x + -1x2 = 0

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

Divide each side by '-1'.
-64 + -16x + x2 = 0

Move the constant term to the right:

Add '64' to each side of the equation.
-64 + -16x + 64 + x2 = 0 + 64

Reorder the terms:
-64 + 64 + -16x + x2 = 0 + 64

Combine like terms: -64 + 64 = 0
0 + -16x + x2 = 0 + 64
-16x + x2 = 0 + 64

Combine like terms: 0 + 64 = 64
-16x + x2 = 64

The x term is -16x.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16x + 64 + x2 = 64 + 64

Reorder the terms:
64 + -16x + x2 = 64 + 64

Combine like terms: 64 + 64 = 128
64 + -16x + x2 = 128

Factor a perfect square on the left side:
(x + -8)(x + -8) = 128

Calculate the square root of the right side: 11.313708499

Break this problem into two subproblems by setting 
(x + -8) equal to 11.313708499 and -11.313708499.

Subproblem 1

x + -8 = 11.313708499 Simplifying x + -8 = 11.313708499 Reorder the terms: -8 + x = 11.313708499 Solving -8 + x = 11.313708499 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = 11.313708499 + 8 Combine like terms: -8 + 8 = 0 0 + x = 11.313708499 + 8 x = 11.313708499 + 8 Combine like terms: 11.313708499 + 8 = 19.313708499 x = 19.313708499 Simplifying x = 19.313708499

Subproblem 2

x + -8 = -11.313708499 Simplifying x + -8 = -11.313708499 Reorder the terms: -8 + x = -11.313708499 Solving -8 + x = -11.313708499 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = -11.313708499 + 8 Combine like terms: -8 + 8 = 0 0 + x = -11.313708499 + 8 x = -11.313708499 + 8 Combine like terms: -11.313708499 + 8 = -3.313708499 x = -3.313708499 Simplifying x = -3.313708499

Solution

The solution to the problem is based on the solutions from the subproblems. x = {19.313708499, -3.313708499}

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