As I have 5th levels as spellcaster can I use a cantrip with damage increased?

@androalmeidaHi @mikemearls. I’m a 1wiz/4bard. As I have 5th levels as spellcaster can I use a cantrip like firebolt with damage increased (2d10)? yes

— (((Mike Mearls))) (@mikemearls) December 22, 2016