Question

calcule a8°termo do p.g (-2,-4,-8...)

Answer 1

a1 = -2
a2 = -4
q = -4/-2 =  2 *****
a8 = a1q^(n-1)
a8 = (-2) ( 2^7)
A8 = ( -2)( 128) = - 256 *****