Question

solve it in copy......

Answer 1

i) f(x+3) = x+6 = (x+3)+3

now take x+3 as y

f(y) = y+3

let f inv (x) = t

x = f(t)= t +3

t = x - 3

f inv x = x-3


ii) f(2x+5) = 4x +13 = 4x + 10 +3 = 2 (2x+5) +3

let 2x +5 = y

so, f(y) = 2y+3

let f inv x = t

x = f(t) = 2t +3

t = (x- 3)/2

so, f inv (x) = (x-3)/2