Answer please. . .
if a,b,c are greater than 0 and (a+b+c)*(ab+bc+ca)=3z, what can be said about z...?
A) z3abc D) z=3abc
Thanks in Advance. . .

• apply AM > = GM
  
  (a+b+c) > = 3* (abc)^(1/3) ----------(1)
  
  (ab+bc+ca) > = 3* (ab*bc*ca)^(1/3) -------------(2)
  
  multiply (1) & (2)
  
  (a+b+c)*(ab+bc+ca) > = 9abc = 3z
  
  => z = 3abc
  
  is it clear 2 u ?
• 10 years agoHelpfull: Yes(6) No(1)
• its only abc nt 3abc or z3abc, coz its a formula
  
• 9 years agoHelpfull: Yes(0) No(0)