Помогите плиз . задание 1 и2

1)
$\frac{ {x}^{2} + 10x + 25 }{16x - {x}^{3} } \times \frac{4x + {x}^{2} }{x + 5} = \frac{ {(x + 5)}^{2} }{x(16 - {x}^{2}) } \times \frac{x(4 + x)}{x + 5} = \frac{x + 5}{(4 - x)(4 + x)} \times \frac{4 + x}{1} = \frac{x + 5}{4 - x}$
2)
$\frac{36 - {x}^{2} }{x + 7} \times \frac{ {x}^{2} + 14 x + 49}{6 - x} = \frac{(6 - x)( 6 + x)}{x + 7} \times \frac{ {(x + 7)}^{2} }{6 - x} = (6 + x)(x + 7)$