Question

Find the sum of the first 50 terms in the sequence -5, -9, -13

Answer 1

Each term is represented by:

-1 - 4k

where k goes from 1 to 50 inclusive.

\[\sum_{1}^{50} (-1 - 4k) = -50 - 4\sum_{1}^{50}k\]

-50 - (4)(50)(51)/2 = -50 - (100)(51) = -50 - 5100

= -5150

Answer 2

thanks

Answer 3

You're very welcome! @onegirl

Answer 4

Good luck to you in all of your studies and thx for the recognition! @onegirl