Question

2. Simplifique as expressões
a) (x + y)2 – x2 - y2
b) (x + y)2 - (x + y) ?

Answer 1

Resposta:

a)

$( {x + y)}^{2} - {x}^{2} - {y}^{2} = \\ \\ {x}^{2} + 2xy + {y}^{2} - {x}^{2} - {y}^{2} = \\ \\ = 2xy$

b)

${(x + y)}^{2} - (x + y) = \\ \\ {x}^{2} + 2xy + {y}^{2} - x - y$