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Question
Evaluate the following :
(5.45)3 + (3.55)3
Sum
Solution
(5.45)3 + (3.55)3
= (5.45 + 3.55)3 - 3(5.45)(3.55)(5.45 + 355)
= (9)3 - 3(4 + 1.45)(4 - 1.45)(9)
= 81 - 3(16 - (1.45)2)(9)
= 81 - 27(16 - 2.1025)
= 81 - 27 x 13.8975
= 81 - 522.3825
= 206.6175.
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