Question

cati termeni negativi contine sirul definit prin formula i n =5n-21

Answer 1

a_n=5n-21
a_0=0-21<0
a_1=5-21<0
a_2=10-21<0
a_3=15-21<0
a_4=20-21<0
Cinci termeni ai sirului sunt negativi.