tlong djwab Cepat yaa

1a) Un = 3n - 1
U1 = 3(1) - 1 = 3 - 1 = 2
U2 = 3(2) - 1 = 6 - 1 = 5
U3 = 3(3) - 1 = 9 - 1 = 8
U4 = 3(4) - 1 = 12 - 1 = 11
U5 = 3(5) - 1 = 15 - 1 = 14

{(2 , 5 , 8 , 11 , 14)}

b) Un = 1/2 n^2 + 2n + 5
U1 = 1/2(1)^2 + 2(1) + 5 = 1/2 + 2 + 5 = 7 1/2
U2 = 1/2(2)^2 + 2(2) + 5 = 2 + 4 + 5 = 11
U3 = 1/2(3)^2 + 2(3) + 5 = 4 1/2 + 6 + 5 = 15 1/2
U4 = 1/2(4)^2 + 2(4) + 5 = 8 + 8 + 5 = 21
U5 = 1/2(5)^2 + 2(5) + 5 = 12 1/2 + 10 + 5 = 27 1/2

{(7 1/2 , 11 , 15 1/2 , 21 , 27 1/2)}

c) Un = (n^2 - 4n)/(2 + 3n)
U1 = (1^2 - 4(1))/(2 + 3(1)) = (1-4)/(2+3) = -3/5
U2=(2^2-4(2))/(2+3(2))=(4-8)/(2+6)= -4/8 = -1/2
U3=(3^2-4(3))/(2+3(3))=(9-12)/(2+9)= -3/11
U4=(4^2-4(4))/(2+3(4))=(16-16)/(2+12)=0/14 = 0
U5=(5^2-4(5))/(2+3(5))=(25-20)/(2+15)=5/17

{(-3/5 , -1/2 , -3/11 , 0 , 5/17)}


2a) 1 , 5 , 9 , 13 , 17 , 21
b) 4 , 16 , 36 , 64 , 100 , 144 , 196