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Question

The value of (105)2 is _______.

A
11025
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B
11065
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C
11625
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D
12425
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Solution

The correct option is A 11025
(105)2 = (100 + 5)2.

Using the identity,
(a+b)2 = (a)2+2ab+(b)2,

(100 + 5)2 = (100)2+2(5)(100)+(5)2

= 10000 + 1000 + 25
= 11025

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