Types of functions, domain, range, composition, inverse.
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Q1 · Functions · EASY
If f(x) = 2x + 3, then f(f(1)) equals
Q2 · Functions · HARD
If f: R → R is defined by f(x) = (x - 1)/(x + 1) for x ≠ -1, then f(f(x)) equals
Q3 · Functions · MEDIUM
The domain of the function f(x) = √(4 - x²) is
Q4 · Functions · MEDIUM
If f(x) = x² and g(x) = x + 1, then (f ∘ g)(x) equals