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17 October, 07:39

write down in term of n an expression for the n th term of the following sequence a) 4,1,-2,-5,-8. b) - 7,-12,-17,-22,-27

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  1. 17 October, 08:48
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    Step-by-step explanation:

    a) a = 4; d = 1-4 = - 3

    nth term = a + (n-1) * d

    = 4 + (n-1) * - 3 = 4 - 3n + 3

    nth term = 7 - 3n

    b) a = - 7; d = - 12 - (-7) = - 12 + 7 = - 5

    nth term = - 7 + (n-1) * - 5

    = - 7 - 5n + 5

    = - 2 - 5n
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