Ask Question
1 November, 17:07

5,-15,45,-135,? what is the next number

+1
Answers (2)
  1. 1 November, 19:03
    0
    This is a geometric sequence since there is a common ratio between each term. In this case, multiplying the previous term in the sequence by

    3

    gives the next term. In other words,

    a

    n

    =

    a

    1



    r

    n

    -

    1

    .

    Geometric Sequence:

    r

    =

    3

    This is the form of a geometric sequence.

    a

    n

    =

    a

    1

    r

    n

    -

    1

    Substitute in the values of

    a

    1

    =

    5

    and

    r

    =

    3

    .

    a

    n

    =

    (

    5

    )



    (

    3

    )

    n

    -

    1

    Remove parentheses.

    a

    n

    =

    5



    3

    n

    -

    1
  2. 1 November, 19:04
    0
    405 ...
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “5,-15,45,-135,? what is the next number ...” in 📘 Mathematics if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers