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Question

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


A
23.99
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B
24.01
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C
25.01
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D
24
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Solution

The correct option is B 24.01
(4.9)2 can be written as (50.1)2.
Using the identity:
(ab)2=a2+b22ab
(5.00.1)2=(5)2+(0.1)22(5)(0.1)=25+0.011=24.01

Mathematics

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