x squared plus y squared minus z square - 2 x 5
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X^2+2xy+y^2-4
(x+y)^2 - 4. [a^2+2ab+b^2=(a+b)^2]
(x+y)^2 - 2^2. [a^2-b^2=(a+b)(a-b)]
(x+y-2)(x+y+2)
(x+y)^2 - 4. [a^2+2ab+b^2=(a+b)^2]
(x+y)^2 - 2^2. [a^2-b^2=(a+b)(a-b)]
(x+y-2)(x+y+2)
karate1:
okk
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