anonymous
  • anonymous
The general term of a sequence is given. Determine whether the given sequence is arithmetic, geometric, or neither. If the sequence is arithmetic, find the common difference; if it is geometric, find the common ratio. an = 4n - 2 A. arithmetic, d = -2 B. geometric, r = 4 C. arithmetic, d = 4 D. neither
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
@cobra-strikes
anonymous
  • anonymous
Hayleymeyer
  • Hayleymeyer
oh wow o_o

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anonymous
  • anonymous
yep this is pre calc 12 grade math haha
anonymous
  • anonymous
Hayleymeyer
  • Hayleymeyer
man, i get help you with that XD, are you good in spanish?
anonymous
  • anonymous
yes
Hayleymeyer
  • Hayleymeyer
omg i love you! can you please help?!
anonymous
  • anonymous
after my quiz breh
anonymous
  • anonymous
anonymous
  • anonymous
what is a1? what is a2? what is a3? what do the terms change by each time?
anonymous
  • anonymous
idk
anonymous
  • anonymous
when n=1 what is a1? plug in 1 and find out
anonymous
  • anonymous
is it 2
anonymous
  • anonymous
and how did you get that?
anonymous
  • anonymous
i plug in one
anonymous
  • anonymous
4(1) - 2 = 4 - 2 = 2. so what is a2?
anonymous
  • anonymous
idk this is so confusing
anonymous
  • anonymous
4(2) - 2 = ?
anonymous
  • anonymous
-6
anonymous
  • anonymous
-6? 4(2) -2 = 8 - 2 = ?
welshfella
  • welshfella
the nth term of arithmetic sequence an = a1 + d(n-1) where d = common difference and a1 = first term
anonymous
  • anonymous
now that makes more sence
anonymous
  • anonymous
@cobra-strikes
welshfella
  • welshfella
compare that general form to an = 4n - 2
anonymous
  • anonymous
ok and what do you mean by that
welshfella
  • welshfella
an = a1 + d(n -1) an =(a1 - d) + dn an = -2 + 4n
welshfella
  • welshfella
comparing coefficients d = ?
anonymous
  • anonymous
-2
anonymous
  • anonymous
welshfella
  • welshfella
i guess that looks a bit confusing with the repeated d but its the last d which gives the common difference so d = 4
welshfella
  • welshfella
a1 - d = -2 so if d = 4 a1 = 2 = first term
welshfella
  • welshfella
the sequence is arithmetic 2 , 6 , 10 .....

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