Question

the minimum value of x to the power 4 + y to the power 4 + z square divided by xyz for positive real number xyz is (a)
$\sqrt{2}$
(b)
$2 \sqrt{2}$
(c)
$4 \sqrt{2}$
(d)
$8 \sqrt{2}$

Answer 1

Use the differentiation technique . find out its derivative and then you will get the relation between these x , y and z . if you can't differentiate directly , take the help of log .