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Q 26. XY=21 and X+Y=13.ans of X & Y will b in points..den x square+y square=??
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- 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 - 10 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 - 10 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 - 10 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 - 10 years agoHelpfull: Yes(2) No(0)
- 127 169-42
- 10 years agoHelpfull: Yes(1) No(0)
- 127...is answer
- 10 years agoHelpfull: Yes(1) No(1)
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