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y = x² - 3
D = R
b)
f(x) = 1/x²
x² ≠ 0
x ≠ 0
D = R \ {0}
c)
f(x) = -2/√x
x ≥ 0
D: x ∈ < 0; +∞)
d)
f(x) = 2x/(x-3)(x+3)
(x - 3)(x + 3) ≠ 0
x ≠ 3
x ≠ -3
D = R \ {-3; 3}