Upgrade RAM in HP Pavilion laptop?

I own an HP Pavilion DV6 6119TX laptop.

Its configuration is -
2.3GHz Ci5 2nd gen, 4GB DDR3 RAM (1333MHz), 640GB HDD, 1GB AMD Radeon HD6490M.

I want to upgrade the RAM to 8GB.

Is it possible (and recommended)? How much will it cost?
 
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