4x2-20x এর সাথে কত যোগ করলে যোগফল পূর্ণবর্গ হবে?
Solution
Correct Answer: Option D
4x2-20x
= (2x)2 - 2.2x.5 + (5)2-25
= (2x-5)2-25
= (2x)2 - 2.2x.5 + (5)2-25
= (2x-5)2-25
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