x&y algebra

In a more expanded form:

2^(x+y)^2 = 2^(x^2 + 2xy + y^2)

2^(x-y)^2 = 2^(x^2 - 2xy + y^2)

by dividing you subtract the roots:

x^2 + 2xy + y^2 - (x^2 - 2xy + y^2)

= 4xy

4*1 = 4

2^4 = 16

(D)

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LevelOne: Senior | Next Rank: 100 Posts; Posts: 69; Joined: Fri Jun 19, 2009 11:46 am; Location: London; Thanked: 1 times

by LevelOne » Mon Jun 22, 2009 12:32 am

ssmiles08, I find your detailed explanation really useful. thanks

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