1. `y=(-2,1),(-1,3),(2,1),(3,2)`, find Domain of a function

Solution:
`y=(-2,1),(-1,3),(2,1),(3,2)`

domain`={-2,-1,2,3}`

range`={1,3,2}`

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2. `y=x^2-3`, find Domain of a function

Solution:
`y=x^2-3`

Domain : all x
Domain set is
Interval Notation : `(-oo,oo)`

Set-Builder Notation : `x in R`

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3. `y=(x+4)/(x-3)`, find Domain of a function

Solution:
`y=(x+4)/(x-3)`

`x-3=0`

`=>x-3=0`

`=>x=0+3`

`=>x=3`

Domain : `x!=3`

Domain set is
Interval Notation : `(-oo,3)uu(3,oo)`

Set-Builder Notation : `x< 3 or x>3`

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