Question

show that f:R→R defined by f(x)=4x+2 is injective and surjective.​

Answer 1

Answer:

f(x) is both injective and surjective

Step-by-step explanation:

let f(x)=f(y)

4x+2=4y+2

x=y hence f(x) is objective

let f(x)=y

4x+2=y

x=(y-2)/4

for any value of y ,

x belongs to R

hence f(x) is surjective

HOPE THIS HELPS...