There is a concrete slab on my side yard, it looked like someone tried
to break it up with a sledge hammer and then gave up. (?)

couple of pics

http://www.sfu.ca/~rhui/house/backyard/DSC01038.JPG
http://www.sfu.ca/~rhui/house/backyard/DSC01040.JPG

Can I use the vinyl patch concrete repair stuff to fix this?
How should I prep the area? Can I use a resurfacing product
afterwards?

Thanks in advance..