Question 1081258
{{{-4}}} | | {{{-4}}} | | {{{-3}}} | |{{{ -1}}} | |{{{ 2}}}

Differences are:
{{{-4}}} | | {{{-4}}} | | {{{-3}}} | |{{{ -1}}} | |{{{ 2}}}
-----{{{0}}}-----{{{1}}}---------{{{2}}}-------{{{ 3}}}  
----------{{{1}}}-------{{{ 1}}}-------{{{ 1}}}  



{{{a[n ]=( 1/2) (n^2 - 3 n - 6)}}} (for all terms given)

{{{a[n]=0.5n^2 -0.5*3n - 0.5*6}}}

{{{a[n]=0.5n^2 -1.5n - 3}}}


answer: B.) {{{y = 0.5x^2-1.5x - 3}}}