Question

Решить уравнение:
(x + 4)^2 - 7 = (x-3)(x+7)

Answer 1

Ответ:

$( {x + 4})^{2} - 7 = (x - 3)(x + 7) \\ {x}^{2} + 8x + 16 - 7 = {x}^{2} + 7x - 3x - 21 \\ 8x - 4x = - 21 - 9 \\ 4x = - 30 \\ x = - \frac{15}{2} \\ x = - 7 \frac{1}{2}$