a_1=7

a_n=a_{n-1}+5

Find a_2

a_1=7

a_n=a_{n-1}+5

Find a_3

a_1=7

a_n=a_{n-1}+5

Find a_6

a_1=6

a_n=-2a_{n-1}

Find a_2

a_1=6

a_n=-2a_{n-1}

Find a_3

a_1=6

a_n=-2a_{n-1}

Find a_6

a_{11}=6

a_n=7a_{n-1}+3

Find a_{12}

How are recurvisive formulas (today) and explicit formulas (yesterday) the same? different? When would be best to use each one?

a_1=4

a_n=(a_{n-1})^2-2

Find the first 4 terms.

a_1=9

a_n=3a_{n-1}-3

Find the first 5 terms.