Question

Expand ( a + 2 ) (a- 1 )​

Answer 1

( a + 2 ) (a- 1 )

=a(a−1)+2(a−1)

=a²−a+2a−2

=a²+(−a+2a)−2. (Combining like terms)

=a² +a−2

Hence, (a+2)(a−1)=a²+a−2.

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