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Multiple choice

If two distinct chords drawn from the poiint (a,b) of the circle ${ x }^{ 2 }+{ y }^{ 2 }-ax-by=0$are bisected by the x-axis,then the roots of the quadratic equation $b^{ 2 }-ax-2b=0$ are

  1. imaginary

  2. real and equal

  3. real and unequal

  4. rational

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