Question

Determine o termo a6 em cada PG:
a)(-7,14,-28,...)
b)(-48,-24,-12,...)
c)$( \frac{64}{25}, \frac{8}{5},1,...)$

Answer 1

a) (-7,14,-28,..)
  
Q=14/-7 = -2

$a_{6}= a_{1}. q^{5} \\ a_{6} = -7 . (-2)^{5} \\ a_{6} = -7 . (-32) \\ a_{6}=224$