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Question
Factorise : a3 + 2a2 - a - 2
Sum
Solution
a3 + 2a2 - a - 2
= a2( a + 2 ) - 1( a + 2 )
= ( a2 - 1 )( a + 2 )
= ( a + 1 )( a - 1 )( a + 2 ) [ ∵ a2 - b2 = ( a + b )( a - b )]
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Method of Factorisation : Difference of Two Squares
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