Hey!
You need so show that
=> Maximum
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Is there any problem for you?
Regards, Rapha
Hello varunnayudu
You might find it easier to use the formula before differentiating. This means you don't get any powers of 2. Instead you get:
when
Then use the fact that
or or , etc.
Taking the first one of these possibilities gives
Now differentiate and show that this value of gives a maximum value of .
Grandad