The roots of a quadratic equation $x^{2} = 49$ are ..... .

  • A
    $7$ and $7$
  • B
    $-7$ and $-7$
  • C
    $7$ and $-7$
  • D
    $7$ and $\frac{1}{7}$

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$x=2$ is a solution of the equation $\ldots \ldots \ldots \ldots.$

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