22-04-2014
Mathematics

Answered

Write a rule for the sequence 3, - 3, - 9, - 15

Verified Answer :

Anonymous Anonymous

22-04-2014

\(3=-3\cdot(-1)\\\\-3=-3\cdot(-1+2)=-3\cdot1\\\\-9=-3\cdot(1+2)=-3\cdot3\\\\-15=-3\cdot(3+2)=-3\cdot5\\\ ext\ terms:\\\\-3\cdot(5+2)=-3\cdot7=-21\\\\-3\cdot(7+2)=-3\cdot9=-27\\\\-3\cdot(9+2)=-3\cdot11=-33\\\vdots\)

\(a_n=-3(2n-3)\)

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