Question

$y = \sqrt{ {3}^{2} x - 1}$
$y = \frac{7}{2x} - 3$
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Answer 1

1) 9х - 1≥0

  9х≥1

   х≥ 1/9

х∈[1/9; ∞)

2) 2x≠0

     х≠0

х∈(-∞;0)U(0; ∞).