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Let f(x) = 2 2 2 2 ) x d ( b x d x a x − + − − + , x ∈ R, where a, b and d are non-zero real constants. Then :

1. f is an increasing function of x
2. f is neither increasing nor decreasing function of x
3. f ′ is not a continuous function of x
4. f is a decreasing function of x

Correct answer: f is an increasing function of x

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