1 "Can Ubuntu 18.04 LTS be installed on a Windows 10x64 bit laptop with an Intel core i3 CPU?" Almost certainly.
2 "Have already tried this by downloading software and burning on to a DVD but it would not boot up and an error message shows an incompatible format being used was the problem." Sounds like the DVD-R already had something on it when you tried to add the ISO file to the DVD-R. DVD-R discs can receive multiple writes, but not if you're trying to make them bootable with an ISO. DVD-Rs are a pain to work with; an inexpensive USB flash drive is much easier to set up, especially with the Windows program Rufus.
3 "Do I need to format another DVD R disk before burning the ISO download or will I have to download a different ISO from the original?" You don't format a DVD-R before putting the ISO on it; the ISO has to be burned onto an absolutely virgin disc, following these instructions from Ubuntu.
Here's a current download of Ubuntu's 18.04.3 ISO file and the SHA256 file used to verify the ISO was not corrupted in the download process using Microsoft's free FCIV utility.