What stude13 said, unless you're planning on staying on private land or a closed track or something. Yeah you could power it, same as a trike.
Bi means two, so you're looking at a quadracycle.
Most of us get by with the law 'cause we're essentially riding bikes. If you plan on motorizing a quad and using it on the street expect the reaction from the cops as if you took a go-cart out.