Q 26. XY=21 and X+Y=13.ans of X & Y will b in points..den x square+y square=??

• xy=21
  
  x+y=13 (squaring both sides we will get)
  
  x^2 + y^2 + 2xy = 169
  
  x^2 + y^2 = 169 - 2*21
  
  x^2 + y^2 = 127
• 11 years agoHelpfull: Yes(43) No(0)
• y=21/x putting value of x in x+y=13
  so x+21/x=13
  x^2-13x+21=0
  x=11.11 & y=1.89
  x^2+y^2=127.00
• 11 years agoHelpfull: Yes(5) No(0)
• (x+y)^2=13^2
  x^2+y2+2xy=169
  x^2+y^2=169-21
  x^2+y^2=148
• 11 years agoHelpfull: Yes(2) No(15)
• xy=21;
  x+y=13;
  x^2+y^2+2xy=169;
  x^2+y^2+2xy=169
  x^2+y^2=169-2*21
  x^2+y^2=127
• 11 years agoHelpfull: Yes(2) No(0)
• 127 169-42
• 11 years agoHelpfull: Yes(1) No(0)
• 127...is answer
  
• 11 years agoHelpfull: Yes(1) No(1)