Question 70434
x-4 / 1

a)None
b) 0
c) -4
d) 4

Think about substituting the possible values given in the multiple choices:

If we substitute x for 0, we have:
x-4 / 1
0-4 / 1
-4 / 1
-4 (this is ok)

If we substitute x for -4, we have:
x-4 / 1
-4-4 / 1
-8 / 1
-8 (this is ok)

If we substitute x for 4, we have:
x-4 / 1
4-4 / 1
0 / 1
0 (this is ok)

So, all answers are ok, which means NONE must be excluded.