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Un=4n-1
U1=4.1-1=4-1=3
U2=4.2-1=8-1=7
U3=4.3-1=12-1=11
U4=4.4-1=16-1=15
b).
Un=10-2n
U1=10-2.1=10-2=8
U2=10-2.2=10-4=6
U3=10-2.3=10-6=4
U4=10-2.4=10-8=2
c).
Un=n²+9
U1=1²+9=1+9=10
U2=2²+9=4+9=13
U3=3²+9=9+9=18
U4=4²+9=16+9=25
d).
Un=2n²+3n
U1=2.1²+3.1=2+3=5
U2=2.2²+3.2=8+6=14
U3=2.3²+3.3=18+9=27
U4=2.4²+3.4=32+12=44
e).
Un=n(2n²-1)
U1=1(2.1²-1)=1(2-1)=1(1)=1
U2=2(2.2²-1)=2(8-1)=2(7)=14
U3=3(2.3²-1)=3(18-1)=3(17)=51
U4=4(2.4²-1)=4(32-1)=4(31)=124