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  • 14-10-2021
  • Mathematics
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if a1 = 7 and an = -2an-1 then find the value of a5

if a1 7 and an 2an1 then find the value of a5 class=

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discipulus
discipulus discipulus
  • 14-10-2021

Answer:

[tex]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[/tex]

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