#### Answer

First four terms of $a_k$ are
1, 3, 5, 7
First four terms of $b_k$ are
1, 3, 5, 13
First three terms match but fourth terms are different

#### Work Step by Step

$a_k = 2k+1$
$b_k = (k-1)^3 +k +2$
The first four terms of $a_k$ are
$a_0 = 2(0)+1 = 1$
$a_1 = 2(1) + 1 = 3$
$a_2 = 2(2) + 1= 5$
$a_3 = 2(3) + 1 = 7$
The first four terms of $b_k$ are
$b_0 = (0-1)^3 +0 +2 = 1$
$b_1 = (1-1)^3 +1 +2 = 3$
$b_2 = (2-1)^3 +2+2 = 5$
$b_3 = (3-1)^3 +3 +2 = 13$