Hold down the apps that you purchased until it shakes. Then you'll see an (x) in the top right hand corner and press it and then it deletes. If you want to get rid of factory made apps go to settings, general, restriction, then select the apps you want and don't want.
Place and hold down your fingers on the app you wish to delete. When the apps start shaking and wobbling around, and when mini X's appear on the top corners of the apps, let go of the app you are holding down. Then, tap on the mini X on the app you want to delete. When it asks to confirm your deletion, tap on DELETE. Hope this helps!