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Algebra

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Moderate

Formula of Geometric

ALGEBR-GSANEM

Find the formula for the geometric sequence with the first term $a_{1}=-5$ and the fourth term $a_{4}=320$.

A

$a_{n}=-5\left( 4 \right)^{n-1}$

B

$a_{n}=-5\left( -4 \right)^{n-1}$

C

$a_{n}=5\left( -4 \right)^{n-1}$

D

$a_{n}=5\left( 4 \right)^{n-1}$

E

none of the above