A (n) = - 5 ∙ 3^ (x - 1)

A (1) = - 5

A (4) = - 135

A (8) = - 10935

Step-by-step explanation:

A (n) = - 5 * 3^ (n - 1)

We want the first term

A (1) = - 5 * 3^ (1 - 1)

= - 5 * 3^0

= - 5 (1)

= - 5

We want the fourth term

A (4) = - 5 * 3^ (4 - 1)

= - 5 * 3^3

= - 5 (27)

= - 135

We want the eight term

A (8) = - 5 * 3^ (8 - 1)

= - 5 * 3^7

= - 5 (2187)

= - 10935