Question

Решите уравнение (6-х)(х+6)-х(х-11)=36​

Answer 1

Ответ:

$6x + 36 - x {}^{2} - 6x - x {}^{2} + 11x = 36 \\ 11x + 36 - 2x {}^{2} = 36 \\ 11x - 2x {}^{2} = 36 - 36 \\ 11x - 2x {}^{2} = 0 \\ x(11 - 2x ) = 0 \\ x = 0 \\ 11 - 2x = 0 \\ - 2x = - 11 \\ \times = \frac{11}{2} \\ x = 5.5$

Ответ : x=0; x=5.5