how did they get the line in red? (1 Viewer)

LoneShadow

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LOL:

let m = 3^k

then the line before the red line is = 0.5*(m-1+2m) = 0.5*(3m-1) <---the red line = 0.5*(3.3^k-1) = 0.5*(3^(k+1) -)
 
P

pLuvia

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Basically it's just adding 'like terms'

Just imagine 1/2(3k-1+2.3k) equals to 1/2(1.3k-1+2.3k) and basically just addition from there
 

kony

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the dot means multiplication, not decimal.
 

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