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Find the intervals in which f(x) = 2x^2 – 3x is increasing.(a) (-1/4, ∞)(b) (-3/4, ∞)(c) (1/4, ∞)(d) (3/4, ∞)The question was asked during a job interview.My question is from Derivatives Application in section Application of Derivatives of Mathematics – Class 12

Answer» CORRECT CHOICE is (d) (3/4, ∞)

For explanation: f(x) = 2x^2-3x.

f’(x) = 4X – 3.

As we know f’(x) = 0, x=-3/4. This SHOWS that function f is increasing in interval (-3/4, ∞) for all x ∈ R.


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