Solution
your laptop manual is located at : https://www.manualslib.com/manual/892791/Hp-15-Notebook-Pc.html
on page : https://www.manualslib.com/manual/892791/Hp-15-Notebook-Pc.html?page=10#manual
is states
1 or 2 customer-accessible/upgradable memory module slots (depending on model)
2 slots: DDR3L-1600MHz Dual Channel Support (Core processors)
1 slot: DDR3-1333MHz Dual Channel Support (DDR3L-1600 downgraded to DDR3-1333)(Bay Trail
processors)
1 slot: DDR3-1333MHz Dual Channel Support (DDR3L-1600 downgraded to DDR3-1066)(Bay Trail
processors)
Supports dual-channel memory
Supports up to 16 GB of system RAM in the following configurations:

16384-MB total system memory (8192×2) or (4096×2) (not for 32-bit operating system or Windows
7 Home)
●...
your laptop manual is located at : https://www.manualslib.com/manual/892791/Hp-15-Notebook-Pc.html
on page : https://www.manualslib.com/manual/892791/Hp-15-Notebook-Pc.html?page=10#manual
is states
1 or 2 customer-accessible/upgradable memory module slots (depending on model)
2 slots: DDR3L-1600MHz Dual Channel Support (Core processors)
1 slot: DDR3-1333MHz Dual Channel Support (DDR3L-1600 downgraded to DDR3-1333)(Bay Trail
processors)
1 slot: DDR3-1333MHz Dual Channel Support (DDR3L-1600 downgraded to DDR3-1066)(Bay Trail
processors)
Supports dual-channel memory
Supports up to 16 GB of system RAM in the following configurations:

16384-MB total system memory (8192×2) or (4096×2) (not for 32-bit operating system or Windows
7 Home)

12288-MB total system memory (8192×1 + 4096×1) (not for 32-bit operating system or Windows 7
Home)

8192-MB total system memory (8192×1) or (4096×2) (not for 32-bit operating system)

6144-MB total system memory (4096×1 + 2048×1) (not for 32-bit operating system)

4096-MB total system memory (4096×1) or (2048×2)

2048-MB total system memory (2048×1)
Supports 6.35-cm (2.5-in) hard drives in 9.5-mm (.37-in) and 7.0-mm (.28-in) thicknesses
 
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