The equation $\sqrt{x + 1} - \sqrt{x - 1} = \sqrt{4x - 1}$ has

  • A
    No solution
  • B
    One solution
  • C
    Two solutions
  • D
    More than two solutions

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If $P(x) = ax^2 + bx + c$ and $Q(x) = -ax^2 + dx + c$ where $ac \neq 0$, then $P(x) \cdot Q(x) = 0$ has $(a, b, c, d \in \mathbb{R})$:

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