Question

derivation of formula a³-b³

Answer 1

a³-b³= (a-b)³ - 3( a²b + ab²)

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Answer 2

Step-by-step explanation:

Step-by-step explanation:

a³-b³=a³-b³+a²b-a²b+b²a-b²a

=a³-a²b -b³+ab²+a²b-b²a

=a²(a-b)+b²(a-b)+ab(a-b)

=(a-b)(a²+b²+ab)