$(5x - 7y - z)^2$ का विस्तार कीजिए।

  • A
    $25x^2 + 49y^2 + z^2 - 70xy + 14yz - 10zx$
  • B
    $25x^2 + 49y^2 + z^2 - 70xy - 14yz + 10zx$
  • C
    $25x^2 + 49y^2 + z^2 + 70xy - 14yz - 10zx$
  • D
    $25x^2 + 49y^2 + z^2 - 70xy + 14yz + 10zx$

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