A 4
B 9
C 16
D 25
Correct Answer: Option D
9x2+30x =(3x)2+2.3x.5+(5)2-25
=(3x+5)2-25
অর্থাৎ 25 যোগ করলে 9x2+30x পূর্ণবর্গ হবে
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