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Hitman42 [59]
3 years ago
6

Find an equation for the nth term of a geometric sequence where the second and fifth terms are -8 and 512, respectively.

Mathematics
1 answer:
11Alexandr11 [23.1K]3 years ago
7 0
Easy
recall that
an=a1(r)^(n-1)
so

given 2nd and 5th term

we get
a2 and a5
so
a2=a1(r)^(2-1)=a1(r)^1=a1r
a5=a1(r)^(5-1)=a1(r)^4

also remember that \frac{x^m}{x^n}=x^{m-n}
so
\frac{a_5}{a_2}= \frac{a_1r^4}{a_1r^1}  =r^{4-1}=r^3= \frac{512}{-8}=-64
so r^3=-64
cube root
r=-4
so

a2=a1r=-8
a2=a1(-4)=-8
divide both sides by -4
a1=2

so

equation is
a_n=2(-4)^{n-1}

C isi the answer
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