Spell combat and spellstrike combo

[lucien pyrus]

So if I understand it right, you can use spell combat to cast a spell as an offhand and spellstrike to deliver it.

I know if you fail the DC for the concentration that the spell is lost, but is the strike that would be used to deliver it be lost?

I would think yes it would be, but I still am unsure.

[Phasics]

you get a free attack to deliver the spell separate from your normal attack routine, so yes if the spell fails you don't get the free attack to deliver it.

[Starglim]

Yes, the free attack that you get for Spellstrike is part of casting the spell.

[Mojorat]

One thing people seem to get confused about. Is Spellstrike does not give you a free attack. it just changes how you can deliver the free attack.