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2 years ago

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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2 years ago

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3 years ago

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timurjin [86]

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2a + 14 = 5a - 13

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2a + 14 + 13 = 5a - 13 + 13

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