anonymous
  • anonymous
Find an explicit rule for the nth term of the sequence. -3, -15, -75, -375, ...
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
I got an = -3 • 5n - 1
anonymous
  • anonymous
the problem (assuming that -3 is referred to as n= 0) is that you don't get the first term in the sequence. one thing to try here it to use some number to a power (because any number to the 0th power is one)
anonymous
  • anonymous
Continue...wait, is my answer incorrect?

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anonymous
  • anonymous
it is incorrect, for n = 0, you got -3( 5 * 0) - 1 0 - 1 if you put in n = 1, you get -3 (5 * 1) -1 -15 - 1
anonymous
  • anonymous
oh wait, I misread the sequence. you go tit right
anonymous
  • anonymous
it is a G.P with C.R=-15/-3=5 tn =ar^(n-1)
anonymous
  • anonymous
a is first term, r is a C.R
anonymous
  • anonymous
tn=-3(5)^(n-1)
anonymous
  • anonymous
Thank You, @alexandercpark and @surjithayer :)

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