Question

What is the expression of x to the 2 -16 equivalent to

Answer 1

The simplest answer, in terms of powers of 2, is

1
---------------
16
2
4 16
Please note that 2 equals 16, and that 2 thus equals 16^4.

Thus, another form in which the answer can be expressed is

1 1
------------- , or ----------- . If you want to take this further, calculate
4 2
16 256



1
--------------------
(256)(256)

Answer 2

If you mean (x^2 -16), then x^2-16 = (x+4)*(x-4). This follows from the formula a^2 - -b^2=(a+b)*(a-b)