# writing a sequence

• May 12th 2008, 05:14 PM
blackhawk9876
writing a sequence
An=1/2 a^3 n-1 +1; A1=0

A1=0
A2=1/2(0)^3+1=1
A3=1/2(O)^3+1=1.5
A4=1/2(1.5)^3+1=2.69
A5=1/2(2.69)^3+1=10.74
would this one be correct?

i cant figure out this one for some reason

An=4(-2)^ n-1

what would A1 and A2 be and why? thank you
• May 12th 2008, 11:35 PM
Moo
Hello,

Quote:

Originally Posted by blackhawk9876
An=1/2 a^3 n-1 +1; A1=0

A1=0
A2=1/2(0)^3+1=1
A3=1/2(O)^3+1=1.5
A4=1/2(1.5)^3+1=2.69
A5=1/2(2.69)^3+1=10.74
would this one be correct?

yep

Quote:

i cant figure out this one for some reason

An=4(-2)^ n-1

what would A1 and A2 be and why? thank you
$A_{\color{red}1}=4 \cdot (-2)^{{\color{red}1}-1}=4 \cdot 1$

$A_{\color{red}2}=4 \cdot (-2)^{{\color{red}2}-1}=\dots$
• May 13th 2008, 05:40 AM
blackhawk9876
thank you(Hi)