functions f an g defined as f(x)=2x-5 an g(x)=x[2]+3 what is f(4) gf(4) an the inverse of f (x)

Question

functions  f an g defined as f(x)=2x-5 an g(x)=x[2]+3 what is f(4) gf(4) an the inverse of f (x)

anonymous · Answer

f(4)=2(4)-5
     =3

gf(4)=g(3)
       =3(2)+3
        =9

f(x)=2x-5 which is the same as y=2x-5      first step is to interchange the values x and y
                                      x=2y-5                then we make y the subject of the formula
                                      x+5=2y
                                     (x+5)/2=y

anonymous · Answer

thank you