MarJ8170 MarJ8170

21-11-2017
Mathematics

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What is the sum of the first 14 terms of the sequence an = 6n -12

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26-11-2017

when n = 1 first term = -6
n = 2 second term = 0
n = 3 third term = 6

n = 4 4th term = 12

so we have an Arithmetic sequence first term = -6 and common difference = 6

Sum 14 terms = (14/2)[2*-6 + (14-1)*6]

= 462 answer

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