What are the restriction the on variables?

4-x/x^2-16

x≠-4 and x≠4

x≠-4

x≠4

No restrictions needed

Find what makes x^2-16=0 and those are the restrictions since denominator cannot equal 0

x^2-16

(x+4) (x-4)

x+4=0

x-4=0

x cannot equal - 4

it can equal 4 because the top will also equal 0 so answer is possible

4-4/4^2-16 = 0/0