1.

If 12x 15 y =9x + 5y, the value of $$ {x^{2}+{y^{2}} over{x^{2}-y^{2}}}$$ is

A. $$ {23 over 17}$$
B. $$ {391 over 409}$$
C. $$ {400 over 9}$$
D. $$ {409 over 391}$$
Answer» E.


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