x^2-2x-64=0

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


Simplifying
x2 + -2x + -64 = 0

Reorder the terms:
-64 + -2x + x2 = 0

Solving
-64 + -2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '64' to each side of the equation.
-64 + -2x + 64 + x2 = 0 + 64

Reorder the terms:
-64 + 64 + -2x + x2 = 0 + 64

Combine like terms: -64 + 64 = 0
0 + -2x + x2 = 0 + 64
-2x + x2 = 0 + 64

Combine like terms: 0 + 64 = 64
-2x + x2 = 64

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 = 64 + 1

Reorder the terms:
1 + -2x + x2 = 64 + 1

Combine like terms: 64 + 1 = 65
1 + -2x + x2 = 65

Factor a perfect square on the left side:
(x + -1)(x + -1) = 65

Calculate the square root of the right side: 8.062257748

Break this problem into two subproblems by setting 
(x + -1) equal to 8.062257748 and -8.062257748.

Subproblem 1

x + -1 = 8.062257748 Simplifying x + -1 = 8.062257748 Reorder the terms: -1 + x = 8.062257748 Solving -1 + x = 8.062257748 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 = 8.062257748 + 1 Combine like terms: -1 + 1 = 0 0 + x = 8.062257748 + 1 x = 8.062257748 + 1 Combine like terms: 8.062257748 + 1 = 9.062257748 x = 9.062257748 Simplifying x = 9.062257748

Subproblem 2

x + -1 = -8.062257748 Simplifying x + -1 = -8.062257748 Reorder the terms: -1 + x = -8.062257748 Solving -1 + x = -8.062257748 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 = -8.062257748 + 1 Combine like terms: -1 + 1 = 0 0 + x = -8.062257748 + 1 x = -8.062257748 + 1 Combine like terms: -8.062257748 + 1 = -7.062257748 x = -7.062257748 Simplifying x = -7.062257748

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.062257748, -7.062257748}

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