Resposta :
(x + y) . (x + y) = x² + 2xy + y²
(x + 2) . (x + 2) = x² + 4x + 4
(3x + 2) . (3x + 2) = 9x² + 12x + 4
(2x + 1) . (2x + 1) = 4x² + 4x + 1
(5 + 3x) . (5 + 3x) = 25 + 30x + 9x²
(x + y) . (x + y) = x² + 2xy + y²
(x + 2) . (x + 2) = x² + 4x + 4
(3x + 2) . (3x + 2) = 9x² + 12x + 4
(2x + 1) . (2x + 1) = 4x² + 4x + 1
(5 + 3x) . (5 + 3x) = 25 + 30x + 9x²