Question

x2 + 8x = 9 me ajudam ​

Answer 1

Resposta:

${x}^{2} + 8x = 9 \\ {x}^{2} + 8x - 9 = 0 \\ {x}^{2} + 9x - x - 9 = 0 \\ x \times (x + 9) - (x + 9) = 0 \\ (x + 9) \times (x - 1) = 0 \\ x + 9 = 0 \\ x - 1 = 0 \\ x = - 9 \\ x = 1 \\ x1 = - 9 \: \: \: \: \: \: x2 = 1$