Question

me ajuda nas questões a b c d e

Answer 1

(a + b)² = (a + b) . (a + b)

= a² + 2ab + b²
= a² + b² + 2ab

a² + b² = x
ab = y

Então

     a² + b² + 2ab
=       x + 2y

Letra E

Answer 2

$(a + b) ^{2} = (a + b) * (a + b) \\ = a ^{2} + 2ab + b ^{2} \\ \\ \boxed{\boxed{= a^{2} + b ^{2} + 2ab}}$

Sendo 

$a ^{2} + b ^{2} = x \\ ab = y \\ \\ \boxed{\boxed{= x + 2y }}$

Alternativa e) x +2y