SOLUTION: Find the first four terms of each sequence. a1=-3 an=2n.an-1, if n is >1.

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Question 1120996: Find the first four terms of each sequence.
a1=-3
an=2n.an-1, if n is >1.
Answer by Tatiana_Stebko(1539) About Me  (Show Source):
You can put this solution on YOUR website!
Is there formula a%5Bn%5D=2n%2Aa%5Bn-1%5D
a%5B1%5D=-3
n=2, then a%5B2%5D=2%2A2%2Aa%5B1%5D=4%2A%28-3%29=-12
n=3, then a%5B3%5D=2%2A3%2Aa%5B2%5D=6%2A%28-12%29=-72
n=4, then a%5B4%5D=2%2A4%2Aa%5B3%5D=8%2A%28-72%29=-576
Answer: -3, -12, -72, -576