Question

is 3, -12, 48, -192, 768 a geometric sequence

Answer 1

well....a geometric sequence is when one term is multiplied by a common number, then the next term can be found.

3 x ? = -12

now see if that same number, multiplied by -12 will give you 48.
and will that same number multiplied by 48 give you -192 ? and so on.

Answer 2

3 * -4 = -12
-12 * -4 = 48 etc. so because of how there is a common factor it is a geometric sequence