RD Sharma - Mathematics (Volume 1)

Book: RD Sharma - Mathematics (Volume 1)

Chapter: 17. Increasing and Decreasing Functions

Subject: Maths - Class 12th

Q. No. 5 of MCQ

Listen NCERT Audio Books to boost your productivity and retention power by 2X.

5

Mark the correct alternative in the following:

If the function f(x) = 2x2 – kx + 5 is increasing on [1, 2], then k lies in the interval.


Formula:- The necessary and sufficient condition for differentiable function defined on (a,b) to be strictly increasing on (a,b) is that f’(x)>0 for all x(a,b)


f(x) = 2x2 – kx + 5



f(x)>0


4x-k>0


K<4x


For x=1


K<4

Chapter Exercises

More Exercise Questions