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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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