Simplify the rational expression. state any excluded values. 4x - 4/ x - 1

We need to simplify this expression:



So, we will call this expression as:


We can write this equation like this:



So, if we simplify it, this can be written like this:

f(x) = 4 but given that the denominator can't be zero, then:
 ∴  

Therefore:
f(x) = 4 if and only if  

Ithink the answer is d.