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1. $9 - 12 x + a x^{2}$

Answer: Option D

Explanation:

9 - 12 x + a x^{2} = 32 - 2.3.2 x + a x^{2} রাশিমালা হতে স্পষ্ট a x^{2} = {(2 x)}^{2} হলে রাশিটি পূর্ণ বর্গ হবে। \Rightarrow a x^{2} = 4 x^{2} ∴ a = 4

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