# Math Help - proof

1. ## proof

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?

2. 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.

3. so will this give a n+2 term and shows its true for all of the sequence.

4. 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 !