Question

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Answer 1

e) (2 + x + y) . (x + y) =
2x + 2y + x² + xy + xy + y² =
x² + 2x + 2y + 2xy + y²

f) (2+x+y)² =
(2+x+y) . (2+x+y) =
4 + 2x + 2y + 2x + x² + xy + 2y + xy + y² = 
x² + 4x + 2xy + 4y + 4 + y²