Question

Exemplo:
(x+y)²
=(x+y) . (x+y)
=x² +xy +xy + y²
=x² + xy + y²

Agora resolva:

a) (a+b) ²

b) (x+3) ²

Answer 1

a)
(a+b)² = a² + 2ab + b²

b)
(x + 3)² = x² + 2.3.x + 3² = x² + 6x + 9

Answer 2

a)

(a + b)
(a + b) . (a + b)
a² + ab + ab + b²
a² + 2ab + b²

b) (x + 3)
   (x + 3) . (x+ 3)
  x² + 3x + 3x + 3²
x² + 6x + 9