Introduction
The bottom cover of the Chromebook 3120 must be removed to perform many repairs on the system, including battery or screen assembly replacement.
Tools
Parts
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            Flip the device over so the bottom is facing up 
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            Remove the 7 visible Philips screws from the device's bottom cover 
 
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            Insert a thin prying tool into the front (facing the user) corner between the rubber bumper and the plastic case to pop several latches. 
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            Starting from the partially-opened corner, pull the case away from the device in a hinging motion. I rotated the computer so that the opened corner faced me in the image. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.