x^2-16x-64=-1

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Solution for x^2-16x-64=-1 equation:


Simplifying
x2 + -16x + -64 = -1

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

Solving
-64 + -16x + x2 = -1

Solving for variable 'x'.

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

Combine like terms: -64 + 1 = -63
-63 + -16x + x2 = -1 + 1

Combine like terms: -1 + 1 = 0
-63 + -16x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '63' to each side of the equation.
-63 + -16x + 63 + x2 = 0 + 63

Reorder the terms:
-63 + 63 + -16x + x2 = 0 + 63

Combine like terms: -63 + 63 = 0
0 + -16x + x2 = 0 + 63
-16x + x2 = 0 + 63

Combine like terms: 0 + 63 = 63
-16x + x2 = 63

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 = 63 + 64

Reorder the terms:
64 + -16x + x2 = 63 + 64

Combine like terms: 63 + 64 = 127
64 + -16x + x2 = 127

Factor a perfect square on the left side:
(x + -8)(x + -8) = 127

Calculate the square root of the right side: 11.26942767

Break this problem into two subproblems by setting 
(x + -8) equal to 11.26942767 and -11.26942767.

Subproblem 1

x + -8 = 11.26942767 Simplifying x + -8 = 11.26942767 Reorder the terms: -8 + x = 11.26942767 Solving -8 + x = 11.26942767 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 = 11.26942767 + 8 Combine like terms: -8 + 8 = 0 0 + x = 11.26942767 + 8 x = 11.26942767 + 8 Combine like terms: 11.26942767 + 8 = 19.26942767 x = 19.26942767 Simplifying x = 19.26942767

Subproblem 2

x + -8 = -11.26942767 Simplifying x + -8 = -11.26942767 Reorder the terms: -8 + x = -11.26942767 Solving -8 + x = -11.26942767 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 = -11.26942767 + 8 Combine like terms: -8 + 8 = 0 0 + x = -11.26942767 + 8 x = -11.26942767 + 8 Combine like terms: -11.26942767 + 8 = -3.26942767 x = -3.26942767 Simplifying x = -3.26942767

Solution

The solution to the problem is based on the solutions from the subproblems. x = {19.26942767, -3.26942767}

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