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n^2 - (n-1)^2 = n + (n-1)

ÀÛ¼ºÀÚ Uploader : math1 ÀÛ¼ºÀÏ Upload Date: 2016-03-20º¯°æÀÏ Update Date: 2016-03-20Á¶È¸¼ö View : 323

n^2 - (n-1)^2 =  n^2 - n^2 + 2n -1 = n + (n-1)

ex) 5^2 - 4^2 = 5 + 4 = 9

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y = n + (n-1)
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