x^2-16x=-1

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


Simplifying
x2 + -16x = -1

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

Solving
-16x + x2 = -1

Solving for variable 'x'.

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

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

Begin completing the square.

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -16x + -1 + x2 = 0 + -1

Reorder the terms:
1 + -1 + -16x + x2 = 0 + -1

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

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

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 = -1 + 64

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

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

Factor a perfect square on the left side:
(x + -8)(x + -8) = 63

Calculate the square root of the right side: 7.937253933

Break this problem into two subproblems by setting 
(x + -8) equal to 7.937253933 and -7.937253933.

Subproblem 1

x + -8 = 7.937253933 Simplifying x + -8 = 7.937253933 Reorder the terms: -8 + x = 7.937253933 Solving -8 + x = 7.937253933 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 = 7.937253933 + 8 Combine like terms: -8 + 8 = 0 0 + x = 7.937253933 + 8 x = 7.937253933 + 8 Combine like terms: 7.937253933 + 8 = 15.937253933 x = 15.937253933 Simplifying x = 15.937253933

Subproblem 2

x + -8 = -7.937253933 Simplifying x + -8 = -7.937253933 Reorder the terms: -8 + x = -7.937253933 Solving -8 + x = -7.937253933 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 = -7.937253933 + 8 Combine like terms: -8 + 8 = 0 0 + x = -7.937253933 + 8 x = -7.937253933 + 8 Combine like terms: -7.937253933 + 8 = 0.062746067 x = 0.062746067 Simplifying x = 0.062746067

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.937253933, 0.062746067}

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