(a+2) (a-1)
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Let us multiply the given expressions (a+2) and (a−1) as shown below:
(a+2)(a−1)
=a(a−1)+2(a−1)
=a
2
−a+2a−2
=a
2
+(−a+2a)−2(Combiningliketerms)
=a
2
+a−2
Hence, (a+2)(a−1)=a
2
+a−2.
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