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1. 4x2-20x

  • A. 4
  • B. 4
  • C. 4
  • D. 4

Answer: Option D

Explanation:

4x2-20x

=4x2-20x+25

=(2x)2-2.2x.5+(5)2

=(2x-5)2 

25 যোগ করলে যোগফল পূর্ণবর্গ হবে।

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