Let f and g be two real functions given by f =

f = {(10, 1),(2, 0), (3, –4), (4, 2), (5, 1)}

g = {(1, 0), (2, 2), (3, –1), (4, 4), (5, 3)}

Since (fg) (x) = f(x) g(x) 

∴ Domain of fg is (Domain of f) ∩ (Domain of g) 

Since Domain of f = {10, 2, 3, 4, 5}

Domain of g = {1, 2, 3, 4, 5}

⇒ Domain of f g is {2, 3, 4, 5}