Question-7766

Question Number 7766 by 314159 last updated on 14/Sep/16

Commented by sou1618 last updated on 14/Sep/16

f (x y) = f (x) + f (y)

f (e^{2}) = - 8 (Q 7771)

f^{″} (2) = ? ?

Commented by Yozzia last updated on 14/Sep/16

f^{″} (2) = 1 ? I^{'} m n o t s u r e i f w h a t I t r i e d

i s w r o n g .

Commented by Yozzia last updated on 15/Sep/16

L e t f (x) = - 4 l n x \Rightarrow f (e^{2}) = - 4 \times 2 = - 8

\Rightarrow f^{'} (x) = - 4 / x \Rightarrow f^{″} (x) = 4 / x^{2} \Rightarrow f^{″} (2) = 4 / 4 = 1

Commented by 314159 last updated on 15/Sep/16

G o o d!

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