Question

Сократите дробь:
$\frac{x^2-5x+4}{16-x^2}$

Answer 1

Ответ:

$-\frac{ {x}^{2} - x - 4x + 4}{(x + 4)(x - 4)} = -\frac{x(x - 1) - 4(x - 1)}{(x - 4)(x + 4)} = -\frac{(x - 1)(x - 4)}{(x - 4)(x + 4)} =- \frac{x - 1}{x + 4} =\frac{1-x}{4+x}$