Question

what is the sum of the series below? ∑[i=1,6](8i-2)

Answer 1

(8-2)+(8*2-2)+(8*3-2)+(8*4-2)+(8*5-2)+(8*6-2)=?

Answer 2

156?

Answer 3

\[\sum_{i=1}^68i-2\] like that?

Answer 4

yes

Answer 5

then since 6 is relatively small you can just grind it out, as myko wrote

Answer 6

you do in fact get 156

Answer 7

so thats the answer?

Answer 8

yup

Answer 9

thank you

Answer 10

yw