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Question

9a2125a+425 can be expressed as ____.

A
(a25)2
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B
(3a25)2
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C
(2a25)2
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D
(a52)2
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Solution

The correct option is B (3a25)2
9a2125a+425=(3a)22×3a×25+(25)2
[Using identity: (ab)2=a22ab+b2]
=(3a25)2

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