Learn All Concepts of Chapter 2 Class 11 Relations and Function - FREE. Check - Relation and Function Class 11 - All Concepts

f:
**
R
**
**
→
**
**
R
**

f(x) = |x| for each x ∈
**
R
**

Here |x| is known as
**
modulus of x
**

|x| is always positive.

So, |–1| = 1

|–2| = 2

|1| = 1

|2| = 1

|0| = 0

Let us rewrite the function

Let’s check for different values of x

####
**
For x = –1
**

x < 0

So, f(x) = – x

f(x) = – (–1) = 1

####
**
For x =
**
**
–2
**

x < 0

So, f(x) = – x

f(x) = – (–2) = 2

####
**
For x = 1
**

x > 0

So, f(x) = x

f(x) = 1

####
**
For x =
**
**
2
**

x > 0

So, f(x) = x

f(x) = 2

####
**
For x = 0
**

x ≥ 0

So, f(x) = x

f(x) = 0

Now,

Plotting graph

Here,

**
Domain
**
= All values of x = R

**
Range
**
= All values of y

*
Since y will always be positive or 0
*

Range = All positive Real numbers and 0