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Question

Using the identities of algebric expressions, the value of (4.9)2 is .

A
24.01
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B
25
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C
23.6
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D
24.25
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Solution

The correct option is A 24.01
(4.9)2=(5.00.1)2

Using the identity (ab)2=a22ab+b2

(5.00.1)2= (5)2 + (0.1)2 - 2(5)(0.1)
=25+0.011
=24.01

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