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Find the interval in which function f(x) = x^2 – 4x + 5 is increasing.(a) (2, ∞)(b) (-∞, 2)(c) (3, ∞)(d) (-∞, ∞)The question was asked during a job interview.Enquiry is from Derivatives Application topic in portion Application of Derivatives of Mathematics – Class 12

Answer» CORRECT option is (a) (2, ∞)

To EXPLAIN: f(x) = x^2 – 4x + 5.

f’(x) = 2x – 4. Therefore f’(x) = 0 gives x = 2.

Now this POINT x=2 divides the line into two DISJOINT intervals and the interval namely (2, ∞) is increasing on f(x).


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