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astraxan [27]
2 years ago
13

If a1 = 7 and an = -2an-1 then find the value of a5

Mathematics
1 answer:
alukav5142 [94]2 years ago
7 0

Answer:

a_1 = 7 \\ a_n =  - 2a_{n - 1} \\ a_2 =  - 2a_1 =  - 2(7) =  - 14 \\ a_3 =  - 2a_2 =  - 2( - 14) = 28 \\ a_4 =  - 2a_3 =  - 2(28) =  - 56 \\ a_5 =  - 2a_4 =  - 2( - 56) = 112

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