Can I save my begonias?

Being the not so expert gardener and forgetful to check its preferences, I put my begonias in full glare of the sun which I now know a few don't like..
Here are my 3 begonias http://imgur.com/rnVBg92
I put them in multi purpose compost. They are getting most of direct sunlight through the day.
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You have answered you own question-got them in a more shaded spot-perhaps a sheltered wall outside??-but protect on cold nights
my begonias haven't come up yet
not sure what i'm doing wrong, but they're in a sun room on the front of my house, should they be in shade?
@Lazy gardener
I suppose I did, but wasn't sure if it was a disease or not
I have put two in a hanging basket where it gets 2 hours max in the sun and the rest in shade. Unfortunatly one of the begonias roots had rotted when I got it out where it was planted. Fingers crossed they live now.
Would it hurt to give them some tomato feed to boost them up?