If the sum of the roots of the equation $ax^2 + bx + c = 0$ is equal to the sum of the squares of their roots,then:

  • A
    $2ac = ab + b^2$
  • B
    $2ac = b(a + b)$
  • C
    $a^2 + b^2 = c^2$
  • D
    $a^2 + b^2 = a + b$

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