Could this endgame have been saved?

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Avatar of Paul1e4

I thought I had a chance to save this endgame. Then I tried to win it, and wound up losing. I am sure I could have saved the endgame, but want to know whether my analysis is correct or faulty. This was an OTB game with 60 minutes time control and a 5 second delay. My opponent had under two minutes left when I resigned. I had more time, but time pressure wasn't a factor in my bad decisions. I have not done the computer analysis.

Avatar of tygxc

42 f4 intending e5 and d6