upgrade ram 4Gb-8GB ASUS EeeBook x403x

Most laptops, you can just undo a panel on the bottom of the laptop and it exposes the RAM and hard drive, if this is not the case then the repair may be a lot more involved.

i just googled yours and it looks like you can just remove all of the bottom screws, look for ones underneath the rubber feet and also under where the battery sits. Once you have them all out pry gently between the top and bottom of the case. If it doesnt feel right, look for more screws, you may be missing some!.