Question

Find S8 for the series -2 + -10 + -50 + -250 +…

Answer 1

it is a gemometric seriies

Answer 2

yep

Answer 3

first find r

Answer 4

5

Answer 5

yes

Answer 6

yup........do u knw to find the sum

Answer 7

Then as a = -2 and r=5, use the geometric sum formula

Answer 8

r>1

Answer 9

since r>1 \[sn = a[r^n -1/(r-1)]\]

Answer 10

@summer1nthec1ty do u get it

Answer 11

thanks guys!

Answer 12

welocme.....--

Answer 13

welcom.....