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What is the nature of function f(x) = x^3 – 3x^2 + 4x on R?(a) Increasing(b) Decreasing(c) Constant(d) Increasing and DecreasingI have been asked this question during an online exam.I would like to ask this question from Derivatives Application in section Application of Derivatives of Mathematics – Class 12

Answer»

The correct OPTION is (a) INCREASING

To explain: F(x) = x^3 – 3x^2 + 4x

f’(x) = 3x^2 – 6x + 4.

f’(x) = 3(x^2 – 2x + 1) + 1.

=> 3(x-1)^2 + 1>0, in every INTERVAL of R. Therefore the FUNCTION f is increasing on R.



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