Question

(3.x+1).(x-1)-3.(x+2).(x+2)= -9

Preciso de Ajuda!!!!​

Answer 1

Resposta:

$\left(3x+1\right)\left(x-1\right)-3\left(x+2\right)\left(x+2\right)=-9\quad :\quad x=-\frac{2}{7}$

Explicação passo a passo:

$\left(3x+1\right)\left(x-1\right)-3\left(x+2\right)\left(x+2\right)=-9\\\left(3x+1\right)\left(x-1\right)-3\left(x+2\right)^2=-9\\-14x-13=-9\\-14x=4\\x=-\frac{2}{7}$