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Question
Evaluate the following :
7.16 x 7.16 + 2.16 x 7.16 + 2.16 x 2.16
Solution
7.16 x 7.16 + 2.16 x 7.16 + 2.16 x 2.16
= (7.16)2 + (2.16)(7.16) + (2.16)2
= (7.16)2 + (2.16)(7.16) + (2.16)2 + (2.16)(7.16) - (2.16)(7.16)
= (7.16)2 + (2.16)(7.16) + (2.16)2 + (2.16)(7.16)
= (7.16 + 2.16)2 - (2.16)(7.16)
= (9.32)2 - 15.4656
= 86.8624 - 15.4656
= 71.3968.
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