Question

The third proportional to $x^2-y^2$ and $(x-y)$ is :

• A.
• B.
• C.
• D.
• E. none

Answer 1

The correct option is D

Let the third proportional to $x^2-y^2$ and $x-y$ be z. Then,

$(x^2-y^2):$ $(x-y)::$ $(x-y)$ : $z$

$z=\frac{(x-y)}{(x+y)}$