For -4 its found
-8• (-4) + 6 = 32 + 6= 38
now compare result 38 with right member. Is it ≤38 ? Yes it is.
For v=10 its found
-8•10 + 6 = -80 +6 = -74
Compare results .Now is -74 ≤ 38. Yes it is.
For v= -6 its found
-8•-6 + 6 = 48 + 6 = 54
Compare result . Is 54≤38 . NO it isnt.
For v= 9 its found
-8•9 + 6 = -72 + 6 = -66.
Now compare result. Is -66 ≤38 ? YES ,it is.