HEY LOOK,

UR SECOND QUESTION IS NOT CLEAR BUT 4 1ST QUEST,

USE AM>GM

(ax+ a/x )  /2   >   (ax*a/x)^{1/2  [ x cancel out each other]}

now,  ax + a/x  >   2a    ( ur answer )

 

right

if ur second question is clear .........plllllllllllllllllllllleeeeeeeeeeeeeeeeaaaaaaaaaaaaaaaassssssssssssssssssseeeeeeeeeeee let me know

THANKU