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b=4
a.u5=5+(5-1)4
=21
b.u8=5+(8-1)4
=33
c.u11=5+(11-1)4
=45
a (suku pertama) = 5
b (beda suku ) = U1 - U2 = 9-5 = 4
Un = a + (n-1)b
U5 = 5 + (5-1) 4
U5 = 5+ (4)4
U5 = 5 + 16 = 21
U8 = 5 + (8-1)4
U8 = 5 + (7)4
U8 = 5 + 28 =33
U11 = 5 + (11-1)4
U11 = 5 + (10)4
U11 = 5 + 40 = 45
semoga benar...jadikan
sebagai yang terbaik:)