x^2-16x+64=81

Solution for x^2-16x+64=81 equation:

Simplifying
x2 + -16x + 64 = 81

Reorder the terms:
64 + -16x + x2 = 81

Solving
64 + -16x + x2 = 81

Solving for variable 'x'.

Reorder the terms:
64 + -81 + -16x + x2 = 81 + -81

Combine like terms: 64 + -81 = -17
-17 + -16x + x2 = 81 + -81

Combine like terms: 81 + -81 = 0
-17 + -16x + x2 = 0

Factor a trinomial.
(-1 + -1x)(17 + -1x) = 0

Subproblem 1
Set the factor '(-1 + -1x)' equal to zero and attempt to solve:

Simplifying
-1 + -1x = 0

Solving
-1 + -1x = 0

Move all terms containing x to the left, all other terms to the right.

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

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

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

Divide each side by '-1'.
x = -1

Simplifying
x = -1
Subproblem 2
Set the factor '(17 + -1x)' equal to zero and attempt to solve:

Simplifying
17 + -1x = 0

Solving
17 + -1x = 0

Move all terms containing x to the left, all other terms to the right.

Add '-17' to each side of the equation.
17 + -17 + -1x = 0 + -17

Combine like terms: 17 + -17 = 0
0 + -1x = 0 + -17
-1x = 0 + -17

Combine like terms: 0 + -17 = -17
-1x = -17

Divide each side by '-1'.
x = 17

Simplifying
x = 17
Solution
x = {-1, 17}