Consider the limit expression
L=x−4x−2asx→4.
Answer the following questions related to L.
a. Part 1: (i) Show that direct substitution of x=4 in the given expression leads to the indeterminate form 0/0.
b. Part 2: (ii) Give a brief explanation, in not more than three sentences, of how a determinate limit can still exist even when direct substitution produces the form 0/0.
c. Part 3: (iii) Determine the exact value of L.