Question

determine os 5 primeiros termos de cada pg.
A1= -80;q=
$\frac{-1}{4}$

Answer 1

$a_1=-80\\ q=\frac{-1}{4}\\\\ a_2=a_1.q=(-80)(\frac{-1}{4})=20\\\\ a_3=a_1.q^2=(-80)(\frac{-1}{4})^2=(-80)(\frac{1}{16})=-5\\\\ a_4=a_1.q^3=(-80)(\frac{-1}{4})^3=(-80)(\frac{-1}{64})=\frac{5}{4}\\\\ a_5=a_1.q^4=(-80)(\frac{-1}{4})^4=(-80)(\frac{1}{256})=\frac{-5}{16}\\\\ P.G.(-80,20,-5,\frac{5}{4},\frac{-5}{16}, \ ...)$