Because first we know 0^2 will still be 0 so we look for one that has -9 and so we can already eliminate A and B (the ones on the left)
Next, take 2^2 for example that is 4 then you minus 9 from that and get -5 so find the table with X = 2 Y = -5 and that would be D so that is your answer!
Hope this helps! LMK if you need more help/ have more questions!
