16 - x ^ { 2 } - 2 x y - y ^ { 2 } – InterviewSolution

1.	16 - x ^ { 2 } - 2 x y - y ^ { 2 }
Answer» 16-(x^2+2xy+y^2)=4^2-(x+y)^2=(4-x-y)(4+x+y)

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