1.2.3b Function Example 2 and 3

Example 2

Function f is defined as

f : x \to \frac{5}{2 x - 1}, x \neq k

$f : x \to \frac{5}{2 x - 1}, x \neq k$

Find the value of k.

Example 3

Given

g : x \to \frac{3 x - 5}{2 x + 7}

$g : x \to \frac{3 x - 5}{2 x + 7}$

Function g is defined for all values of x except x = a. Find the value of a.