Question 656507


{{{-1}}}, {{{2}}}, {{{-4}}}, {{{8}}},........

is an infinite sequence where every term doubles multiplying with {{{-2}}}

{{{-1*-2=2}}}, 

{{{2(-2)=-4}}}, 

{{{-4(-2)=8}}}, 

{{{8(-2)=-16}}},

{{{-16(-2)=32}}}

{{{32(-2)=-64}}}.....so, your sequence is 

{{{-1}}}, {{{2}}}, {{{-4}}}, {{{8}}},{{{-16}}},{{{32}}},{{{-64}}}.....