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

Mathematics NECO 2004

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

  • -3a
  • -\(\frac{3}{2}\)
  • \(\frac{9}{4}\)
  • \(\frac{9a}{4}\)
  • \(\frac{9^2}{4}\) checkmark

The correct answer is: E

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