1.

If $$ {x over y}={y over w}$$ then what is the value of (xy+zw).

A. $$ {(x^{2}+z^{2})(y^{2}+w^{2})}$$
B. $${(x^{2}{y^{2}+z^{2}w^{2}})}$$
C. $${(x^{2}{w^{2}+y^{2}z^{2}})}$$
D. $$ {(x^{2}+w^{2})(y^{2}+z^{2})}$$
Answer» B. $${(x^{2}{y^{2}+z^{2}w^{2}})}$$


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