Q1 of 59 Page 162

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

(7.2)2 = (7 + 0.2)2


⇒ (7.2)2 = 72 + 0.22 + 2× 7× 0.2


⇒ (7.2)2 = 49 + 0.04 + 2.8


⇒ (7.2)2 = 51.84


So C is the correct option.

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