Function f(x)= 2x -kx +5 is increasing on [ 1, 2 ] then k lies in the interval
Answer (1)
31st Jul, 2020
Hello sharma ,
Here the function is f(x)=2x-kx+5
in the interval [1,2]
First we are equalling the function f(x)=0
After substitute the first interval , then f(1)=2(1)-k(1)+5=0
solve the above equation you will get k=7
After substitute the second interval in the function f(2)= 2(2)-k(2)+5=0
solve the above equation you will get k=9/2 =4.5
the interval for k is [4.5,7]
I hope this will help for you.
THANK YOU.
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