Question

7)Dada a expressão ( x + 3)², a alternativa correta é: * 1 ponto a)x² – 9 b) x² + 3x + 9 c) x² – 3x + 9 d) x² + 6x + 9

Answer 1

Alternativa D)

= (x + 3)²

= x² + 6x + 9

Answer 2

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

$(x+3)^2=x^2+3^2+2(3)(x)\ \therefore$

$\boxed{(x+3)^2=x^2+6x+9}$

Letra D.