Question One HDMI output port, two external displays ?

[gordonfreemanjr]

I need a multiple display-related advice.

1: My PC has 1 x HDMI output and 3 x USB outputs.

2: The external display #1 is a TV (HDMI input). That’s what I’m using right now.

3: The external display #2, which I’ve just gotten, features multiple input ports, including an HDMI port.

I’ve heard that HDMI splitters/adapters only let you mirror the screen, while my goal is to extend it.

Question: how do I extend my PC screen to both external display #1 and external display #2 successfully?

 

[Lutfij]

When posting a thread of troubleshooting nature, it's customary to include your full system's specs. Please list the specs to your build like so:
CPU:
CPU cooler:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
Monitors:
include the age of the PSU apart from it's make and model. BIOS version for your motherboard at this moment of time.

If we're dealing with a laptop, please pass on the make, model and SKU of the laptop.