Question

 Then f decreases in the interval   

Solution

Correct option is

(1, 2)

                (Using Leibnitz-rule)

Using number line rule for f’(x) we get,  

    

 

SIMILAR QUESTIONS

Q1

 

 a minimum at x= 1 is the value of a is    

 

Q2

Assuming that be petrol burnt in a motor boat varies as the cube of its velocity, the most economical speed when going against a current of ckm/hr is 

Q4

Let (x) be a function such that f’(a≠ 0. Then at x = α ; f (x)

Q5

The minimum value of 

Q6

Find the interval in which f (x) = 2x3 + 3x2 – 12x + 1 is increasing.

Q7

Find the interval in which (x) = x3 – 3x2 – 9x + 20 is strictly increasing or strictly decreasing.

Q8

 

Find the interval of increase or decrease of the 

                 

Q9

The function (x) = sin4 x + cos4 x increasing if: