Answer :

(a + 2)(a – 1)= a2 + [(2)+(-1)] a + [(2)×(-1)]


{ (x + p)(x + q)= x2 +(p + q)x +(p × q)


Here x = a, p = 2, q = -1 }


= a2 +(2 – 1)a +(-2)


= a2 + 2a – a – 2


= a2 + a – 2


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