Найти область определения функции: очень срочно! пожалуйста!

A)
$y = \sqrt{\frac{-4x}{-10-x}}\\\\ \frac{-4x}{-10-x} \geq 0\\\\ \frac{-4x}{-(x+10)} \geq 0\\\\ \frac{4x}{x+10} \geq 0\\\\ x_1=0\\ x \neq -10$

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..........(-10)................. 0..................
$x \in (-\infty;-10) \cup [0;+\infty)$

B)
$y = \sqrt{\frac{x+11}{x^2+14x+33}}\\\\ \frac{x+11}{x^2+14x+33} \geq 0\\ x_1 = -11\\\\ x^2+14x+33 \neq 0\\ D = 49-33=16, \sqrt{D} = 4\\\\ x \neq -14-4 \neq -18\\ x \neq -14+4 \neq -10\\$

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..........(-18)...................-11.............(-10)..............
$t \in (-18;-11] \cup (-10; +\infty)\\$