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1. $x^{3} + 6 x^{2} y + 11 x y^{2} + 6 y^{3}$

Answer: Option B

Explanation:

x^{3} + 6 x^{2} y + 11 x y^{2} + 6 y^{3} = x^{3} + x^{2} y + 5 x^{2} y + 5 x y^{2} + 6 x y^{2} + 6 y^{3} = x^{2} (x + y) + 5 x y (x + y) + 6 y^{2} (x + y) = (x + y) (x^{2} + 5 x y + 6 y^{2}) = (x + y) (x^{2} + 3 x y + 2 x y + 6 y^{2}) = (x + y) [x (x + 3 y) + 2 y (x + 3 y)] = (x + y) (x + 2 y) (x + 3 y)

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