Question

help

Answer 1

don't really understand recursive formulas

Answer 2

unlike explicit formulas, you have to calculate the terms of a recursive formula in order starting from the first term

Answer 3

an = 2*(a_n - 1) + 2
means take the first term, multiply it by 2, and then add 2 to get the second term (4)

Answer 4

then, for the third term, you would take the second term, multiply it by 2, then add 2 to get the third term

Answer 5

ugh so it would be 2*2+2 for the third term

Answer 6

yup

Answer 7

that's incorrect

Answer 8

oh whoops

Answer 9

because that would be 2*2=4 +2 =6

Answer 10

the second term is 4 not 2, yeah ;;

Answer 11

so it's 2(4) + 2 = 10

Answer 12

ohh you woukld get the answer to the term before??? not the term right

Answer 13

right

Answer 14

that's the difference between recursion and explicit formulas

Answer 15

so 22 for the next one right

Answer 16

and so on

Answer 17

yup good

Answer 18

quick question

Answer 19

I understand that with the initial term the rest of the terms are dependent upon that.. but how do I get the second term?

Answer 20

so an means "term with index n"
a_(n-1) means "term with index n - 1" or in other words, the term before an

Answer 21

an = a_(n-1) + 7

means take the previous term, and add 7 to get the next term

Answer 22

so 1+7 right

Answer 23

a1 = - 2

so it would be -2 + 7 = second term

Answer 24

since it's recursive you're using the actual values not the indexes (indices)

Answer 25

so 5

Answer 26

good

then you would take 5 and add 7 to get term 3

Answer 27

and this time I would do 5*-2 +7?

Answer 28

ohh I don't have to do anything with the -2?

Answer 29

nah, you're done with term 1 since you already have term 2 now

Answer 30

12
19

Answer 31

good