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January 26, 2015

January 26, 2015

Posted by **JOSEPH** on Saturday, April 28, 2012 at 7:55pm.

1)1,8,27,64,....125

the nth is n

2) 3,8,15, 24,.....35

the nth is

Can you help me and correct ? thank you

- algebra2/trig -
**Reiny**, Saturday, April 28, 2012 at 10:43pm1) looks like you are dealing with the cubes

so term(n) = n^3

2) did you notice that each term is one less than a perfect square?

e.g.

3 = 2^2 - 1 --term(1)

8 = 3^2 -1 -- term(2)

15 = 4^2 -1

24 = 5^2 - 1

35 = 6^2 - 1

so term(n) = (n+1)^2 -1

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