Question

Calcular a soma dos 6 primeiros termos da P.G (-3,6,-12,24,...)

Answer 1

(-3,6,-12,24,-48,96)= 53

Answer 2

a1 = -3
a2 = 6
q = 6/-3 = -2 ***
n = 6
a6 = a1q⁵
a6 = -3 * ( - 2)⁵ = (- 3 )* (-32) = 96 ***
S6  = (-3)[ ( -2)⁶  - 1 ]/ ( -2 -1)
S6 = ( -3)[ 64 - 1 ]/ (-3)
S6 = -3 * (63)/(-3)
S6 = -3 * (-21) = 63 ****
PG { -3, 6, -12, 24, -48, 96 ]