Identity Function f(x) = x

Last updated at July 31, 2026 by

f: R -> R

f(x) = x for each x ∈ R

i.e. y = x for each x ∈ R

 

Plotting graph

x

0

1

–2

y

0

1

–2

 

Identity Function.jpg

Here,

Domain   = All values of x = R

Range = All values of y

    = All values of x (Since x = y)

   = R

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