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Find the intervals in which f(x) = x^2 + 2x – 5 is strictly increasing.(a) x>1(b) x-1(d) x>2The question was asked by my school teacher while I was bunking the class.Question is from Derivatives Application topic in division Application of Derivatives of Mathematics – Class 12

Answer»

Right OPTION is (c) X>-1

The best explanation: f(x) = x^2+2x -5.

f’(x) = 4x – 3.

As we KNOW f’(x) = 0, x=-3/4, which shows that function f is INCREASING in interval (-3/4, ∞) for all x ∈ R.



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