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B
20.25
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C
19.25
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D
19
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Solution
The correct option is B 20.25 (4.5)2 can be written as (5.0−0.5)2 This is in the form of (a−b)2 where, a= 5 and b = 0.5 We know that, (a−b)2=a2+b2−2ab (4.5)2=(5)2+(0.5)2−2(5)(0.5) =25+0.25−5 ⇒ 20.25 Hence, the value of (4.5)2 is 20.25.