Question

Сократите дробь и найдите ее значение при х=-3

Answer 1

$\frac{x {}^{2} - 5x + 4 }{x - 4} = \frac{x {}^{2} - x - 4 x+ 4}{x - 4} = \frac{x(x - 1) - 4(x - 1)}{x - 4} = \frac{(x - 1)(x - 4)}{x - 4} = x - 1 = - 3 - 1 = - 4$