Please help with clarification on extenders ac1900

Hello, 

I am a total newbie so please go gently. I just purchased the wifi extender ac1900 since I have a location in my house that the wifi completely drops off and becomes inaccessible.   I pay for 150 Mbps internet service and get close to that speed if I am in the main part of my home. Once I installed the extender I am able to get around 10 Mbps in the problem area which is ok but not great. My question is this. Can I run a hard wire from my modem to the extender in order to boost its wifi output in that area? I would like to keep using my modem inside my home since I get great speeds. Please let me know if this can be done.