MCQ
9 x-7 x y का वर्ग है-
  • A
    $81 x^2+49 x^2 y^2$
  • B
    $81 x^2-49 x^2 y^2$
  • $81 x^2+49 x^2 y^2-126 x^2 y$
  • D
    $81 x^2+49 x^2 y^2-63 x^2 y$

Answer

Correct option: C.
$81 x^2+49 x^2 y^2-126 x^2 y$
(c)

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