Question 864454
Create (x,y) pairs
 { {-4,7},{-3,4},{1,2},{2,-3},{3,-3},{7,-8}}
Use as input to www.wolframalpha

polynomial fit { {-4,7},{-3,4},{1,2},{2,-3},{3,-3},{7,-8}}

0.0121464x^4 -0.0507054x^3 -0.319384x^2 -0.885199x +2.09549 (quartic)
R^2 = 0.820057


See http://www.statisticshowto.com/adjusted-r2/ for a discussion of adjusted R2