The operation denoted by the symbol @ is defined for all real numbers a and b as a@b=a+b+√(a²+b²). What is the value of 5@(3@4) ? (A) 25 (B) 30 (C) 40 (D) 35 (E) 20

• Ans is B (30)
  Simple sol : first sol (3@4)=3+4+√(3²+4²) = 3+4+5 = 12
  then solve 5@12 = 5+12+√(5²+12²)=5+12+13=30
• 5 years agoHelpfull: Yes(0) No(0)
• 5@(3@4)
  => 5@(3+4+√(9+16))
  => 5@12
  => 5+12+√(25+169)
  => 5+12+13
  = 30
• 2 years agoHelpfull: Yes(0) No(1)