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27 September, 12:26

What are the first five terms of the sequence defined by the given function?

(1) = - 6

f (n) = } (n - 1) + 2, for n = 2, 3, 4, ...

O A. 6,-4,-2,0, 2

B. 2, 8, 14, 20, 26

c. 6,-8.-10.-12, - 14

D. 2.-4.-10.-16, - 22

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Answers (1)
  1. 27 September, 15:31
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    -6,-4,-2,0,2

    is the answer if I interpreted your recursive sequence equation correctly.

    Step-by-step explanation:

    I'm going to assume the following:

    f (1) = -6

    f (n) = f (n-1) + 2

    They alread give you the first term is - 6.

    So we want to find the next 4 terms.

    The second term is given by f (2).

    So we replace n with 2:

    f (n) = f (n-1) + 2 with n=2

    f (2) = f (2-1) + 2

    f (2) = f (1) + 2

    f (2) = -6+2

    f (2) = -4

    The third term is given by f (3).

    So we replace n with 3:

    f (n) = f (n-1) + 2 with n=3

    f (3) = f (3-1) + 2

    f (3) = f (2) + 2

    f (3) = -4+2

    f (3) = -2

    The fourth term is given by f (4).

    We are going to replace n with 4.

    f (n) = f (n-1) + 2 with n=4

    f (4) = f (4-1) + 2

    f (4) = f (3) + 2

    f (4) = -2+2

    f (4) = 0

    The fifth term is given by f (5).

    We will replace n with 5.

    f (n) = f (n-1) + 2 with n=5

    f (5) = f (5-1) + 2

    f (5) = f (4) + 2

    f (5) = 0+2

    f (5) = 2

    So the first 5 terms are given by the values of:

    f (1), f (2), f (3), f (4), f (5).

    The values we got in order are:

    -6,-4,-2,0,2

    This should also make sense from reading:

    f (1) = -6

    f (n) = f (n-1) + 2

    That bottom equation says to find a term you just add 2 to the previous term. They gave us the first term was - 6 and told us just to add 2 to generate the terms after.

    First term is - 6.

    Second term is - 6+2=-4.

    Third term is - 4+2=-2.

    Fourth term is - 2+2=0

    Fifth tern is 0+2=2.

    In the future this sequence is called an arithmetic sequence because the term and previous term has the same difference; this is called a commom difference.
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