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  1. The expression x4 – 2x2 + k will be a perfect square if the value of k is
    1. 1
    2. 0
    3. 1
      4
    4. 1
      2
Correct Option: A

Expression = x4 – 2x2 + k
= (x2)2 – 2.x.2 .1 + (1)2 – (1)2 + k
For a perfect square,
–1 + k = 0 ⇒ k = 1


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