Question 51312
ah composite functions! problems!

For the functions f(x) = 4x + 7 and g(x) = -9x + 11, 
find f(g(0)). 

       f(g(x))= f(-9x+11) = 4(-9x+11)+7
                          = 4(-9*0+11)+7   (subtitute the values for ,0)
                          = 4*11+7
                          = 44+7
                          =51




For the functions f(x) = 3x2 - 7     ( actually wat U mean by 3x2,U mean 3(x^2) or (3x)^2)---and g(x) = -3x2 + 4, 
find f(g(2)).


     f(g(x))= f(-3x^2+4) = 3(-3x^2+4)^2-7
  substiude x to 2=>     = 3(-3(2^2)+4)^2-7
                         =3*(-8)^2-7
                         =3*64-7
                         =192-7
                         =  185 



For the functions f(x) = 3x2 - 7
and g(x) = -3x2 + 8, 
find g(f((-4)). 

          so f(g(x)) = 3{[-3(x^2)+8]^2}-7
                x=(-)4=>  3(-40)^2-7
                     = 3*1600-7
                     =4800-7  
                     = 4793


For the functions f(x) = 3x2 - 8
and g(x) = -7x2 + 5, 
find g(f((-4)). 


         so f(g(x)) = 3{[-7(x^2)+5]^2}-8
                x=(-4)=> 3{[-7((-4)^2)+5]^2}-8


                      = ???        You try it as the above