If (x:y)=2: 1,then(x^2-y^2): (x^2+ y^2) is
If(x:y)=2:1,then(x2−y2):(x2+y2)is:
A3:5
B5:3
C1:3
D3:1
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If(x:y)=2:1,then(x2−y2):(x2+y2)is:
Correct Answer: 3:5
Explanation:
xy=21 (Given)
Expression=x2−y2x2+y2=x2y2−1x2y2+1
=(21)2−1(21)2+1=4−14+1=35
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