Question

A) (3X-9).(3X+9)=
B) (X+7):(X-7)=

Answer 1

Resposta:

A)

$9x^2 -81$

B)

$x=7\\\\ou\\\\\frac{x+7}{x-7}$

Explicação passo-a-passo:

A) (3x-9) . (3x+9)

$(3x)^2 . (-9)^2\\9x^2 -81$

B) (x+7) : (x-7)

$x-7-0\\x=7\\\\ou\\\\\frac{x+7}{x-7}$