what squared minus what squared equals 43

We can answer this with this equation :

(n + 1)^2  - n^2   = 43   simplify

n^2 + 2n + 1 -  n^2  = 43

2n + 1 = 43     subtract 1 from both sides

2n  = 42       divide both sides by 2

n  = 21

So  .....n + 1 = 22

Proof

22^2   - 21^2  =

484 - 441  =

43