Geometric Sequence_ Explicit Formula

What is the explicit formula for the sequence?

4, -20, 100, -500, ...

• $a_n=4\left(2\right)^{n-1}$

• $a_n=4\left(-5\right)^{n-1}$

• $a_n=3\left(-5\right)^{n-1}$

• $a_n=3\left(2\right)^{n-1}$

What is the explicit formula for the sequence?

-1, 2, -4, 8, ...

•  $a_n=-\frac{1}{2}\left(2\right)^{n-1}$ 

•  $a_n=-\frac{1}{4}\left(2\right)^{n-1}$ 

•  $a_n=-2\left(-\frac{1}{2}\right)^{n-1}$ 

•  $a_n=-\left(-2\right)^{n-1}$ 

What is the explicit formula for the sequence?

2, 6, 18, 54, ...

•  $a_n=-9\left(-5\right)^{n-1}$ 

•  $a_n=-10\left(-5\right)^{n-1}$ 

•  $a_n=2\left(3\right)^{n-1}$ 

•  $a_n=2\left(-3\right)^{n-1}$ 

What is the explicit formula for the sequence?

-4, -8, -16, -32,...

•  $a_n=-2\left(2\right)^{n-1}$ 

•  $a_n=-4\left(2\right)^{n-1}$ 

•  $a_n=-2^{n-1}$ 

•  $a_n=2\left(-2\right)^{n-1}$ 

What is the explicit formula for the sequence?

-3, 6, -12, 24,...

•  $a_n=3\left(2\right)^{n-1}$ 

•  $a_n=-3\left(-2\right)^{n-1}$ 

•  $a_n=3\left(-3\right)^{n-1}$ 

•  $a_n=3\left(3\right)^{n-1}$ 

What is the explicit formula for the sequence?

192, 48, 12, 3, ...

•  $a_n=3\left(\frac{1}{4}\right)^{n-1}$ 

•  $a_n=3\left(4\right)^{n-1}$ 

•  $a_n=192\left(\frac{1}{4}\right)^{n-1}$ 

•  $a_n=192\left(4\right)^{n-1}$ 

What is the explicit formula for the sequence?

-2, -4, -8, -16,...

•  $a_n=\left(-5\right)^{n-1}$ 

•  $a_n=-\left(-2\right)^{n-1}$ 

•  $a_n=-2\left(2\right)^{n-1}$ 

•  $a_n=-2\left(-2\right)^{n-1}$ 

What is the explicit formula for the sequence?

3, 15, 75, 375, ...

•  $a_n=-4^{n-1}$ 

•  $a_n=-4\left(4\right)^{n-1}$ 

•  $a_n=3\left(5\right)^{n-1}$ 

•  $a_n=4\left(-5\right)^{n-1}$ 

What is the explicit formula for the sequence?

-4, 24, -144, 864, ..

•  $a_n=-4\left(-6\right)^{n-1}$ 

•  $a_n=-5\left(-6\right)^{n-1}$ 

•  $a_n=\frac{2}{3}\left(-6\right)^{n-1}$ 

•  $a_n=\frac{5}{3}\left(-6\right)^{n-1}$ 

What is the explicit formula for the sequence?

3, 15, 75, 375, .. 

•  $a_n=12\left(4\right)^{n-1}$ 

•  $a_n=3\left(5\right)^{n-1}$ 

•  $a_n=3\left(3\right)^{n-1}$ 

•  $a_n=3\left(4\right)^{n-1}$