Question

(x + 9) × (x +8) me ajude

Answer 1

x²+17x+72

(x+9) (x+8)

x.x = x²

x.8+9= 17x

9.8 = 72

Answer 2

$(x + 9).(x + 8) = \\ {x}^{2} + 8x + 9x + 72 = \\ {x}^{2} + 17x + 72 = 0 \\ delta = (17)^{2} - 4.(1).(72) \\ delta = 289 - 288 \\ delta = 1 \\ \\ x = \frac{ - 17 + 1}{2} \\ x = - 8 \\ x = \frac{ - 17 - 1}{2} \\ x = - 9$