Answers

2016-07-06T18:33:37+08:00
(a-b)³ = a³-3a²b+3ab²-b³

In other words,
1st step: the cube of the first terms
2nd step: minus 3 times the square of the first terms multiplied by the second term
3rd step: plus 3 times the first term multiplied by the square of the second term
4th step: minus the cube of the second term
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