Question

calcule o quarto e o setimo termo da pg 3 -6 12 ?
ajude me pf

Answer 1

$a1=3\\a2=-6\\a3=12\\a4=a1.(\frac{a2}{a1})^{4-1}\\\\\boxed{a4=3.(-2)^3=3.(-8)=-24}\\\\q=\frac{a2}{a1}=-2\\\\a7=a1.q^{7-1}\\\\\boxed{a7=3.(-2)^6=3.64=192}$