Question

considerando a PG (-2,4,-8,16,-32,...), encontre o primeiro termo a1 e a razão q

Answer 1

P.G.( -2 , 4 , -8 , 16 , -32 ,...)

$a_1=-2 \\ \\ a_1=-2~~~e~~a_2=4 \\ \\ q=a_2\div a_1 \\ q=4\div(-2) \\ \\ q=-2$