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Q:

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

  • 1
    $$ {23\over 17}$$
  • 2
    $$ {391\over 409}$$
  • 3
    $$ {400\over 9}$$
  • 4
    $$ {409\over 391}$$
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Answer : 4. "$$ {409\over 391}$$"

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