Answer:
536,870,912
Step-by-step explanation:
the formula for geometric sequences is:
aₙ = a₁·[tex]r^{n-1}[/tex]
where aₙ is, in this case the 15th term
r = common ratio which, in this case, is -4
a₁ = first value in the sequence
so:
a₁₅= 2(-4)^14
= 2(268,435,456)
= 536,870,912
