Question

$a {3} - b {3} \div a - b$
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Answer 1

Answer:

A²-b² is answer. ........

a³-b³ = (a-b)³ = (a-b)(a-b)(a-b). ok now on putting this in question.......

=(a-b)(a-b)(a-b)/a-b. ok now

=(a-b)(a-b). [ (a-b) is cancelled by a-b ]

=(a-b)²

=a²-b² ok now