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

(a – b)2 = a2 –2ab + b2
x4 – 2x2 + k = (x2)2 – 2.x2 .1+ k
∴  k = (1)2 = 1


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