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  1. If 4x2 – 12x + k is a perfect square, then the value of k is
    1. 2
    2. 9
    3. 12
    4. 10
Correct Option: B

(a – b)2 = a2 – 2ab + b2
∴  4x2 – 12x + k = (2x)2 – 2 × 2x × 3 + k
∴  k = (3)2 = 9


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