$49 x^{2}-42 x+9$ ના અવયવ પાડો.

  • A
    $(7x-3)(7x+3)$
  • B
    $(7x-3)(7x-3)$
  • C
    $(7x+3)(7x+3)$
  • D
    $(49x-3)(x-3)$

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અવયવ પાડો:
$6x^{2} + 7x - 3$

ઘનનું વાસ્તવિક ગણન કર્યા વગર,નીચેનાની કિંમત શોધો:
$(21)^{3} + (15)^{3} + (-36)^{3}$

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