$9x^{2} + 42x + 49$ ના અવયવ પાડો.

  • A
    $(3x + 7)^{2}$
  • B
    $(3x - 7)^{2}$
  • C
    $(9x + 7)(x + 7)$
  • D
    $(3x + 7)(3x - 7)$

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