Question

What is the 7th term of the geometric sequence -1, 4, -16

Answer 1

7th term = ar^6
a = -1 and r = 4/-1

Answer 2

\[a _{n} = a _{1}r ^{n - 1}\]
\[a _{n} = -1(-4) ^{7 - 1}\]
\[a _{n} = -1(-4) ^{6}\]
\[a _{n} = -1(4096)\]
\[a _{n} = -4096\]

Answer 3

After the first equation, it should be a_7

Answer 4

Not a_n

Answer 5

the \(n^{th}\) term of Geometric sequence is given by a\(r^{n-1}\) where a is first term. r is common ratio.