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February 28, 2015

February 28, 2015

Posted by **astrid** on Wednesday, March 19, 2008 at 6:48pm.

- algebra -
**Damon**, Wednesday, March 19, 2008 at 7:12pmn and (n+1)

Star in Swedish :)

n(n+1) = 11 + n + (n+1)

n^2 + n = 2 n +12

n^2 - n - 12 = 0

(n-4)(n+3) = 0

try n = 4

then n+1 = 5

check:

4*5 = 20

4+5 = 9

sure enough, 20 = 9 + 11

- algebra -
**astrid**, Wednesday, March 19, 2008 at 7:22pmOkay thank you so much!

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