If the functions f(x) and g(x) are defined by f(x)=5x+2; g(x)=x−23 then find the value of gf(3).
If f(x) and g(x) are real function defined by f(x)={x ,xisrational0 ,xisirrational and g(x)={0 ,xisrationalx ,xisirrational, then (f−g)(x) is