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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Аноним Аноним
  • 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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