Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
because Jax's stats are currently wrong (date:10/19/2010) this is incomplete
Fabled Jax is all about creating synergy between his passive "Equipment Mastery", AP, AD, HP, and MP while hitting hard like a DPS champ should.
Jax gains 3 HP per point of AD and 2 HP per point of AP received from items.
UNIQUE Passive: 2% of your maximum mana is converted to attack damage (2 divided by 100 = 0.02 x max mana = AD converted).
Passive: 3% of your Max Mana is converted to Ability Power (3 divided by 100 = 0.03 x max mana= AP converted) .
Adding these passives into one equation we get :
(Max mana x0.02 = AD converted x3= HP bonus) + (Max mana x0.03 = AP converted x2= HP bonus) = total HP bonus
This equation means an increase in maximum mana results in an increase of both AP and AD which in turn causes an increase in max health.