Question

FATORAÇÃO DE POLINÔMIOS

5 – Marque a alternativa que contenha o desenvolvimento correto do produto (a + 3) ⋅ (a - 3). *

a) (a + 3) ⋅ (a - 3) = a ⋅ a + 3 ⋅ 3 = a² + 3² = a² + 9

b) (a + 3) ⋅ (a - 3) = a ⋅ a + 3 ⋅ a + a ⋅ 3 + 3 ⋅ 3 = a² + 6a + 9

c) (a + 3) ⋅ (a - 3) = a ⋅ a - 3 ⋅ a - 3 ⋅ a - 3 ⋅ 3 = a² - 3² = a² - 9

d) (a + 3) ⋅ (a - 3) = a ⋅ a - 3 ⋅ a + 3 ⋅ a - 3 ⋅ 3 = a² - 3² = a² - 9​

Answer 1

Resposta:

(a + 3) ⋅ (a - 3) =

a.a + a.-3 + 3.a + 3.-3 =

a²  -  3a  +  3a  -  9 =

a²      |_____|   - 9  resposta   d)

 

Explicação passo-a-passo:

Answer 2

RESPOSTA : D)

ESPERO TER AJUDADO