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What is the nature of function f(x) = 7x-4 on R?(a) Increasing(b) Decreasing(c) Strictly Increasing(d) Increasing and DecreasingThe question was posed to me in an interview.Origin of the question is Derivatives Application in division Application of Derivatives of Mathematics – Class 12

Answer»

Correct CHOICE is (c) Strictly Increasing

Easiest explanation: Let X1 and X2 be any two numbers in R.

Then x1 7×1 < 7×2.

=> 7×1 – 4 < 7×2 – 4.

As F(x1) < f(x2), thus the function f is strictly increasing on R.



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