Question
Without actually calculating the cube, find the value of $(28)^3 + (-15)^3 + (-13)^3$
✓
Answer
$(28)^3 + (-15)^3 + (-13)^3$
$= 3(28)(-15)(-13) (\because (28) + (-15) + (-13) = 0)$
$= 16380$
$= 3(28)(-15)(-13) (\because (28) + (-15) + (-13) = 0)$
$= 16380$
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