Question

Find the first six terms of the sequence. a1 = -1, an = 2 • an-1

Answer 1

answers

-2, -4, -8, -16, -32, -64

-1, -2, -4, -8, -16, -32

-1, -2, 0, 2, 4, 6

0, 2, -2, 0, 2, 4

Answer 2

a1 = -1
a2 = 2 . a1 = 2 . (-1) = -2
a3 = 2 . a2 = 2 . (-2) = -4
I'm sure you can do it from here.

Answer 3

-2, -4, -8, -16, -32, -64

Answer 4

\(\large {
a_{\color{brown}{ n}}=2\cdot a_{{\color{brown}{ n}}-1}\qquad
\begin{array}{lrllll}
term& value
\\\hline\\
a_1&-1\\
a_{\color{brown}{ 2}}&2\cdot a_{{\color{brown}{ 2}}-1}\to 2\cdot a_1\\
a_{\color{brown}{ 3}}&2\cdot a_{{\color{brown}{ 3}}-1}\to 2\cdot a_2\\
a_{\color{brown}{ 4}}&2\cdot a_{{\color{brown}{ 4}}-1}\to 2\cdot a_3\\
a_{\color{brown}{ 5}}&2\cdot a_{{\color{brown}{ 5}}-1}\to 2\cdot a_4\\
a_{\color{brown}{ 6}}&2\cdot a_{{\color{brown}{ 6}}-1}\to 2\cdot a_5\\
\end{array}
}\)

Answer 5

Yes @amandaaaaaaaaaaa that's correct !