Question

Real valued function f is defined by f(x)=3/x-3.find(-4)?

Answer 1

f(x) = 3/(x-3)
to find f(-4) put x = -4
f(-4) = 3/(-4-3) = -3/7
hence f(-4) = -3/7

Answer 2

$If\ f(x)\ is\ \ \frac{3}{x-3},\ \ then\ \ f(-4)\ \ =\ \ \frac{3}{-7} \\ \\ If\ \ f(x)\ \ is\ \ \frac{3}{x}\ \ then\ \ \frac{3}{-4}-3 \ \ =\ \ \frac{-15}{4}$