prove 4 + 12 +20 + ... +(8n-4) =4n^2 true for n=1 (8n-4) + 8(n+1)-4 = 4n^2 +8(n+1)-4 simplify but then how do i finish off?
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Hello Originally Posted by skystar (8n-4) + 8(n+1)-4 = 4n^2 +8(n+1)-4 simplify but then how do i finish off? Once you've simplified the expression, try to factor it by 4.
so will this give a n+2 term and shows its true for all of the sequence.
Originally Posted by skystar so will this give a n+2 term and shows its true for all of the sequence. If you meant n+1, that's it !
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