Question

X(x+9)=(x+9) Preciso urgentemente

Answer 1

$x(x+9)=(x+9) \\ x^2 + 9x = x + 9 \\ x^2 + 9x - x - 9 = 0 \\ x^2 + 8x - 9 = 0 \\ a = 1, b = 8, c = -9 \\ \\ \Delta = b^2 - 4ac \\ \Delta = 8^2 - 4 \times 1 \times (-9) \\ \Delta = 64 + 36 \\ \Delta = 100 \\ \\ x = \frac{-b \pm \sqrt{\Delta}}{2a} \\ x = \frac{-8 \pm \sqrt{100}}{2 \times 1} \\ x = \frac{-8 \pm 10}{2} \\ \\ x = \frac{-8 + 10}{2} \\ x = \frac{2}{2} = 1 \\ \\ x = \frac{-8 -10}{2} \\ x = \frac{-18}{2} = -9$

Answer 2

x=1
ou a 0 pois a pergunta é um pouco ilogica