Question

Calcule ( x+4) . (x-4) =​

Answer 1

-4x + 4x = 0

Portanto, x^2 - 16

Answer 2

Vamos lá,

(x+4) × (x-4)

(x + 4)(x + −4)

(x)(x) + (x)(−4) + (4)(x) + (4)(−4)

x^2 − 4x + 4x − 16

x^2 − 16