Question

qual é o 6 termo da p.g (-240,-120,-60,...)

Answer 1

$a_{n} = a_{6} =?; n=6; a_{1} =-240; q= \frac{1}{2}$

$x_{n} = a_{1} * q^{n-1}$

$a_{6} =-240* \frac{1}{2}^{n-1}$

$a_{6} =-240* \frac{1}{2}^{5}$

$a_{6} =-240* \frac{1}{32}$

$a_{6} = \frac{-240}{32}$         (simplifique por 15)

$a_{6} = \frac{-15}{2}$