14. Without actually calculating the cubes, find the value of each of the following
(i) (-12)^3 + (7)^3 + (5)^3
(ii) (28)^3 + (-15)^3 + (-13)^3
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(i) ( − 12)3 + (7)3 + (5)3 = ( − 12 + 7 + 5) + 3( − 12)(7)(5) = 0 + 1260 = 1260
(ii) (28)3 + ( − 15)3 + ( − 13)3 = (28 − 15 − 13) + 3(28)( − 15)( − 13) = 0 + 16380 = 16380
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