Question

Complete the recursive formula of the geometric sequence -0.6, 3, -15, 75, ...

Answer 1

Answer:

$\boxed{Un = 3(-5)^{n - 2}}$

Step-by-step explanation:

We know that

a = -0,6 = $-\frac{3}{5}$ and r = $\frac{3}{-0,6}$ = -5

.

So

$Un = ar^{n - 1}$

$Un = (-\frac{3}{5} )(-5)^{n - 1}$

$Un = (3)(-5)^{-1}(-5)^{n - 1}$

$Un = 3(-5)^{n - 2}$

Answer 2

Answer:

use this form 》Un = ar^(n - 1)