Question

Найдите значение выражения
х² +4х+4 :2х+4
х²- 25 :6x+30
при х = 3.​

Answer 1

$\frac{ {x}^{2} + 4x + 4 }{2x + 4} = \frac{(x + 2) {}^{2} }{2(x + 2)} = \frac{x + 2}{2} = \frac{3 + 2}{2} = \frac{5}{2} = 2.5$

$\frac{ {x}^{2} - 25 }{6x + 30} = \frac{(x - 5)(x + 5)}{6(x + 5)} = \frac{x - 5}{6} = \frac{3 - 5}{6} = - \frac{2}{6} = - \frac{1}{3}$