### Home > INT1 > Chapter 10 > Lesson 10.1.1 > Problem10-22

10-22.

Write the first four terms of each of the following sequences.

1. $a_n=3·5^{n−1}$

• Evaluate the equation for $n = 1, n = 2, n = 3,\text{ and }n = 4$.

1. $a_1=10,\ a_{n+1}=-5a_n$

• This sequence is being defined recursively.
The first term is $10$.
The next term is calculated by multiplying the previous term by $−5$.
Continue the pattern.