Question

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

Answer 1

Resposta:

$(3x + 1) \times (x - 1) - 3 \times (x + 2) = - 9 \\ 3x {}^{2} - 5x - 2 = 0 \\ x = - ( - 5) - \sqrt{( - 5) {}^{2} } - 4 \times 3 \times 2 \\ 2 \times 3 \\ - ( - 5) + \sqrt{( - 5) {}^{2} } - 4 \times 3 \times 2 \\ 2 \times 3 \\ x = \frac{2}{3} 1$