Question

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Answer 1

Решение:

5.

f(x) = √(x - 3)

f(52) = √(52 - 3) =√49 = 7

6.

a) f(x) = x² - 3x - 8

D(f) = (-∞; +∞)

б) f(x) = 3/(x - 11)

x ≠ 11

D(f) = (-∞; 11) ∪ (11; +∞)

в) f(x) = √(x - 3)

x ≥ 3

D(f) = [3 +∞)