What must be added to b2-3ab to make it a perfect square?

What must be added to b2-3ab to make it a perfect square?
  • A.
    -3a
  • B.
    -(frac{3}{2})
  • C.
    (frac{9}{4})
  • D.
    (frac{9a}{4})
  • E.
    (frac{9^2}{4})
Correct Answer: Option E
Explanation
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