Question

Find the first six terms of the sequence. a1=-7, an=2*an-1

Answer 1

The first term of the sequence is $a_{1} = -7$ . 

The sequences is recursive, every next term of the sequence is obtained by multiplying the previous term by 2.

So, we can find the next 6 terms as shown below:

$a_{2} = 2*a_{1}=2(-7)=-14$ 
$a_{3} = 2(-14)=-28$ 
$a_{4} = 2(-28)=-56$ 
$a_{5} = 2(-56)=-112$ 
$a_{6} = 2(-112)=-224$ 
$a_{7} = 2(-224)=-448$