Question

Write the sum using summation notation, assuming the suggested pattern continues.

5 - 15 + 45 - 135 + ...

Answer 1

do you know the pattern of this sequence

Answer 2

first notice that terms are alternating sign, and second each term is the previous term multiplied by 3

Answer 3

@Brandon77 its being multiplied by -3

Answer 4

right now just put it in summation form

Answer 5

I got it thanks

Answer 6

no problem : )

Answer 7

(-3)n or (-3)n+1?