Is there a similar solve for say … 4^1*2 + 4^2*3
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So you’re asking how to factor 2x + 3x^2?
You can factor x: x(2 + 3x). Or in this example, 4(2 + 4*3).
What about Σ4^n *(n+1)
What would it look like to you if there were one? I’m not sure what kind of “similar” you have in your mind.