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What is the 15th term of the sequence an = -2n(n 3)?

What is the 15th term of the sequence an = -2n(n 3)?
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What is the 15th term of the sequence an = -2n(n 3)?

User Colin
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an = -2n(n + 3)
a(15) = -2(15)(15 + 3) = -30(18) = -540
User Thislooksfun
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