For a system of conservative forces,the potential energy $U$ is given by the formula $U = ax^2 - bx$,where $a$ and $b$ are constants. Determine the force $F$.

  • A
    $-2ax + b$
  • B
    $ax + b$
  • C
    $2ax - 2b$
  • D
    $2ax + 2b$

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