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Q.
The third proportional to(x2−y2)x2-y2 and (x−y)x-y is :
A.
(x + y )
B.
(x - y)
C.
(x + y) / ( x - y)
D.
(x -y) / ( x + y)
View Answer
Correct choice: D
Explanation:
Let the third proportional to (x2−y2)x2-y2 and (x−y)x-y be z. Then, (x2−y2):(x−y)::(x−y):zx2-y2:x-y::x-y:z =>(x2−y2)*z=(x−y)2=>x2-y2*z=x-y2 => z=(x−y)2/(x2−y2)=(x−y)/(x+y)
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