Suatu fungsi f dirumuskan sebagai f ( x ) = 3x – 2
dengan daerah asal A = { -2 , - 1 , 0 , 1 , 2 } .
Tentukan range.
Jawab :
f ( x ) = 3x – 2
x = –2 maka
f ( x ) = 3x – 2
f ( –2 ) = 3 . ( –2 ) – 2
= ( –6 ) – 2
= – 8
x = –1 maka
f ( x ) = 3x – 2
f ( –1 ) = 3 . ( –1 ) – 2
= ( –3 ) – 2
= – 5
x = 0 maka
f ( x ) = 3x – 2
f ( 0 ) = 3 . ( 0 ) – 2
= 0 – 2
= – 2
x = 1 maka
f ( x ) = 3x – 2
f ( 1 ) = 3 . ( 1 ) – 2
= 3 – 2
= 1
x = 2 maka
f ( x ) = 3x – 2
f ( 2 ) = 3 . ( 2 ) – 2
= 6 – 2
= 4
Range nya adalah { -8 , -5 , -2 , 1 , 4 }