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1. 4a2+9b2 রাশিটির সাথে কত যোগ করলে যোগফল পূর্ণবর্গ হবে?

Answer: Option B

Explanation:

4 a^{2} + 9 b^{2} = {(2 a)}^{2} + {(3 b)}^{2} = {(2 a)}^{2} + 2.2 a . 3 b + {(3 b)}^{2} - 12 a b = {(2 a + 3 b)}^{2} - 12 a b সুতরাং রাশিটির সাথে 12ab যোগ করলে রাশিটি পূর্ণবর্গ হবে।

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