1.

Let A = R- {(3)/(5)} " and" B =R -{(7)/(5)} Let f: A to B: f (x) =(7x +4)/(5x-3) " and" g: B to A: g (y)= (3y+4)/(5y-7) Show that(g o f)I_(A) " and" ( fog) = I_(B)

Answer»

Solution :Let `x in A. `Then
(g o f)(x) = g [f (x)]
`=g ((7x+4)/(5x-3))`
`=g(y) " where " y =(7x+4)/(5x-3)`
`=(3y+4)/(5y-7) =(3((7x+4)/(5x-3))+4)/(5((7x+4)/(5x-3))-7) "" "[using (i)]"`
`=((21 x+12 +20x-12))/((5x-3)) XX ((5x-3))/((35 x+20 -35 x+21))`
`=(41x)/(41) =x= I_(A) (x)`
`:. (gof)=I_(A)`
Againlet `y in B .` Then
( FOG)(y) = f[g (y)]
`=f((3y+4)/(5y-7))`
`=f(z)" where"z= (3y+4)/(5y-7)`
`=(7z+4)/(5z-3) =(7((3y+4)/(5y-7))+4)/(5((3y+4)/(5y-7))-3)`
`=((21 y+28 +20y-28))/((5y-7)) xx ((5y-7))/((15y+20 -15y+21))`
`=(41y)/(41) =y= I_(B) (y)`
`:. (f o g)=I_(B)`
hence(f o g ) `=I_(A)" and" (f o g) =I_(B)`


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