jagrutmahendra6 jagrutmahendra6

08-03-2020
Mathematics

contestada

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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devishri1977 devishri1977

08-03-2020

Answer:

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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