Question

b) (x + 3) . (x − 2) = 0

Answer 1

Explicação passo-a-passo:

$(x + 3)(x - 2) = 0 \\ {x}^{2} - 2x + 3x - 6 = 0 \\ {x}^{2} + x - 6 = 0 \\ \\ d = {1}^{2} - 4 \times 1 \times ( - 6) \\ d = 1 + 24 \\ d = 25 \\ \\ x = \frac{ - 1 \frac{ + }{ - }5 }{2} \\ \\ x1 = \frac{ - 1 + 5}{2} = \frac{4}{2} = 2 \\ \\ x2 = \frac{ - 1 - 5}{2} = \frac{ - 6}{2} = - 3$