Question

Questão 1
(×-4)(×+4)

Answer 1

Resposta:

(x-4)(x+4)

x²+4x -4x -16

x²-16

x² = 16

x = √16

x = ±4

Answer 2

Resposta:

(x-4)(x+4) = 0

x² + 4x -4x -16 = 0

x² - 16 = 0

x² = 16

$\sqrt{16}$ = x

x = ±4