question about registers

I am new into this field X32 Bit i havent come across these but what does it mean when it says​etc.. [rax + rdx*4] How can i find offset for this sort of register?? link to tableThank you by HowToHack on Reddit.com question about registers - I am new into this field X32 Bit i havent come across these but what does it mean when it says​etc.. [rax + rdx*4] How can i find offset for this sort of register?? link to tableThank you

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