Urgent math
posted by Briane Mendez
Please help me solve this problem?!?!
Find the first six terms and the sixth partial sum of the sequence whose nth term is
an = 5n2 − n.
a1 =
a2 =
a3 =
a4 =
a5 =
a6 =
S6 =

Steve
well, finding the first six terms is easy, right?
An = 5n^21, so here's a table:
n An
1 5*1^21 = 51 = 4
2 5*2^22 = 202 = 18
3 5*3^23 = 453 = 42
4 5*4^24 = 804 = 76
5 5*5^25 = 1255 = 120
6 5*6^26 = 1806 = 174
Now just add 'em up to get S6
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