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Question

The value of (7.2)2 is (use an identity to expand):

A
49.9
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B
14.4
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C
51.84
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D
49.04
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Solution

The correct option is C 51.84
We will use, (a+b)2= a2+2ab+b2 to find the required result.

Substitute 7 for a and 0.2 for B in the above identity,
(7+0.2)2=(7)2+2(7)(0.2)+(0.2)2
=49+2.8+0.04
=51.84

Hence, option C is correct.

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