If the value of (⊗ + 5)

2
is 81, what is the value of (⊗ + 5)
2 + 1?

Assuming you mean (⊗ + 5)^2

If (⊗ + 5)^2 = 81 then this would imply that ⊗ = 4 and (4 + 5)^2 = 81.

Therefore, (⊗ + 5)^2 + 1 = (4 + 5)^2 + 1 = 82.